Blocks editor won't open

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I have an brand new emachine with windows 7 and the latest java software bought 
mainly for the purpose of android app development. Unfortunately, when i click 
to open the blocks editor the .jnlp file is downloaded, a small black script 
box appears and disappears then a few minuites later it still hasnt opened and 
i get a message asking if i wish to continue. What on earth is wrong with my 
computer? It frustrates me that there is no solution anywhere to this problem. 
i tryed the java web start demos on the java site and they did a similar thing, 
downloading a file but never producing the program. Please can anyone help me? 
I will be so grateful, thanks.

Original issue reported on code.google.com by Smaointe...@gmail.com on 17 Jan 2011 at 3:32

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I am having the same problem with my windows 7 64bit system, except I have 
tried downloading/running the necessary .jnlp file from IE, firefox, and even 
google chrome, and all of them just bring up the file showing a bunch of xml 
garbage but my appinventor page never goes past saying "Opening the block 
editor...click to cancel"

It is very frustrating because it seems like none of these browsers know what 
to do with that file, when I tell them to open it they just show what the text 
basically says, not very helpful!!

Original comment by lyricalg...@gmail.com on 11 Feb 2011 at 5:45

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[deleted comment]

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I am running vista 32-bit and have the same problem. I have resorted to opening 
the file AppInventorForAndroidCodeblocks.jnlp in chrome, firefox, and java. 
When I open it with java a command window flashes on the screen and disappears.
When I open the file with firefox a box says "do you want to open or save this 
file" and saves a copy if I choose save. If I choose to open, the same box 
opens with the same question in another tab. When I open the file with chrome, 
a new tab opens with this text across the top.

App Inventor for Android Blocks Editor Google App Inventor for Android Blocks 
Editor http://appinventor.googlelabs.com:80/ode/webstartfile/ 
-8ntepffpjok21kid31esczx0r97t58fz0nowqt0twfksu9odwit4ipn1nvf46gfj9nzak2yu41ephdp
d1gy667x61buliq5fx7cl44rh9z4im9cu4avesyh61921v6q0mq7399543yewy0am/ true

Original comment by AustinPB...@gmail.com on 20 Feb 2011 at 11:11

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Hello Everyone! Hope everyone is doing well.
I have a question.  I opened my blocks editor this a.m. and 'all' my blocks for 
a project have disappeared! I tried the zoom-in-zoom out feature as well as 
scrolling left-right, up-down, but to no avail. Is there a recent known bug 
with the block editor? 
All help appreciated. This just started yesterday. And then when I launched it 
today, its still the same. Also, when clicking on the 'my definitions' tap in 
the blocks editor, there are no definitions listed under that option.

Original comment by Sigit...@gmail.com on 4 Apr 2011 at 8:16

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My block editor just continues to download and wont open

Original comment by azmusich...@gmail.com on 11 May 2011 at 12:35

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I have the same problem...please help us!

Original comment by pasquine...@gmail.com on 18 Jun 2011 at 6:20

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would be nice to use this.....if they would fix it so I could use it... have 
SAME issues as stated above....like some one else says....HELP US

Original comment by tronwolv...@gmail.com on 22 Jun 2011 at 5:21

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I have a very similar problem. My project is very large and the block editor 
refuse to open my project. When it does, it immediately froze.  Please help us.

Original comment by haitiant...@gmail.com on 23 Jun 2011 at 2:09

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[deleted comment]

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i am using Google chrome (v13 beta) and is says it is open when it isn't

Original comment by srikaant...@gmail.com on 2 Jul 2011 at 12:35

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Win7 64bit, newest java, tried chrome, ie, firefox.
Stuck and frustrated at Hello Purr.

Original comment by dannyf...@gmail.com on 5 Jul 2011 at 9:12

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Blocks editor wont start, the java window just says "Downloading application" 
but never opens

Original comment by dwimp...@gmail.com on 8 Sep 2011 at 10:39

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i also have the same issue, if we could just locate a link to download the jnlp 
ourselves and save it on our computers manually this wouldnt be a problem

Original comment by joshrock...@hotmail.co.uk on 10 Sep 2011 at 11:39

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It is a problem with the firewall. You have to allow connections to java.exe 
and javaws.exe. 
http://www.errorpedia.info/index.php?title=App_Inventor#El_editor_de_bloques_.28
Blocks_Editor.29_no_se_inicia

Original comment by puup...@yahoo.es on 3 Oct 2011 at 4:26

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After clicking on the block editor a "Java Spash" screen is displayed then 
"Downloading application" screen shows up and it hangs.  I have turned off all 
the firewalls and have the latest Java.  I am running Vista -32bit. 

Original comment by dicomp....@gmail.com on 31 Oct 2011 at 9:44

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I have this problem too only it worked fine several minutes ago.  I saved paint 
pot project 1 and opened a new copy for version 2 and now the blocks editor 
won't open for any of my projects. It simply sits at opening blocks editor. 
Windows 7 64-bit system

Original comment by danwitha...@gmail.com on 9 Nov 2011 at 10:34

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I've been waiting for the block editor to open for an hour now.....Every few 
minutes im prompted to continue waiting...HELP??????

travisjminter@gmail.com

Original comment by kbprepre...@gmail.com on 10 Nov 2011 at 5:20

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I've been waiting for the block editor to open for an hour now.....Every few 
minutes im prompted to continue waiting...HELP??????

travisjminter@gmail.com

Original comment by kbprepre...@gmail.com on 10 Nov 2011 at 5:20

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Same problem here, it worked just after installation once.  No it just sits 
there waiting to open block editor.  Can anybody solve this??

Original comment by MISTECHS...@gmail.com on 29 Nov 2011 at 5:27

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Ok, I solved my own problem...  I can only tell you what I did, I assume it 
will work on other browsers.  First, change your browsers download location to 
somewhere other than the current location.  Second, cancel the supposed opening 
of blocks editor on the project page.  Try to open blocks editor again.  When 
the file is done downloading, go to the download location on your PC (the 
desktop for me), and run it from there.  It would seem to me that each time you 
tried to open blocks editor, and downloaded the file, it would make a copy as 
they have the same name each time.  So after looking in my downloads folder, I 
noticed there were no files marked .jnlp.  Can't open a file that is not there. 
 If you use Internet Explorer it would even be more difficult to figure out.  
IE downloads to a temp folder by default and its not in a easy to find spot on 
the HDD.  Hope this helps someone.

Original comment by MISTECHS...@gmail.com on 29 Nov 2011 at 6:01

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IT WORKED!  I CREATED A NEW DOWNLOAD FOLDER AND THAT SOLVED IT!

Original comment by mattko...@gmail.com on 29 Nov 2011 at 8:17

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-->Matko 
Congratulations. I never tried that. I ended up getting a new computer and now 
it works.

Original comment by AustinPB...@gmail.com on 30 Nov 2011 at 3:47

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If you are running Java 7:
1) Control panel
2) Search Java
3) Click Java
4) In Java window, click Java tab
5) View Runtime Environment Settings
6) Disable Java 7
7) Apply

Original comment by sethga...@gmail.com on 1 Dec 2011 at 10:00

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I had the same problem, and your solution to change download directories worked 
perfectly- although I don't know that you need to actually change the 
directory.  If you open the blocks editor and download the .jnlp you can just 
open it on through navigating to the containing folder on your pc rather than 
clicking the downloaded object within the browser...
cheers!

Original comment by dan.djba...@gmail.com on 1 Dec 2011 at 5:01

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Wow, thanks for figuring that out!! Lost a few hours on that one.

I found a little different solution: Simply deleting the file 
(AppInventorForAndroidCodeblocks.jnlp) in my download location BEFORE trying to 
open the block editor made it work fine.

Just another step to opening the block editor prevents you from having to 
constantly change the download location and prevents having multiple copies of 
that .jnlp scattered all over your hard drive in numerous locations. 

Original comment by Chadscl...@gmail.com on 4 Dec 2011 at 4:06

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Quoted text

Comment 23 by sethga...@gmail.com, Dec 1 (5 days ago)
If you are running Java 7:
1) Control panel
2) Search Java
3) Click Java
4) In Java window, click Java tab
5) View Runtime Environment Settings
6) Disable Java 7
7) Apply

=====================================

You genius!!! been trying everything... all forums, app inventor faq's etc and 
got faq all... 
your one solution could have saved me hours of frustration and swearing.

Thank you so much.

Original comment by davidduf...@googlemail.com on 6 Dec 2011 at 11:33

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Hey everyone I tried all this nothing worked until I turned my virus protection 
off. No more issue.

Original comment by rebrockm...@gmail.com on 13 Dec 2011 at 12:00

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Original comment by yonglinw...@gmail.com on 11 Mar 2012 at 9:28

• Changed state: Noted

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Comment 23 by sethga...@gmail.com, Dec 1, 2011

If you are running Java 7:
1) Control panel
2) Search Java
3) Click Java
4) In Java window, click Java tab
5) View Runtime Environment Settings
6) Disable Java 7
7) Apply

Worked for me, running Win 7 32 bit. Thanks for your help!

Original comment by Alex.Neu...@gmail.com on 28 May 2012 at 6:54

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Comment 23

Bang on. Worked like a dream

Original comment by junaidka...@googlemail.com on 29 May 2012 at 9:09

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My issue was resolved vy disablimg my anti virus as suggested above.. hundreds 
of sesions then opened.. all of the ssessions I have tried before! I then 
looked at the advanced setiings of my anti virus ( AVG ) and added the saved 
AppInventorForAndroidCodeblocks-4.jnlp file as an execeptiopn to "potentially 
unwanted programs" and I was able to turn my anti virus back on and the block 
editor nopw works fine so long as I execute the saved file rather than use the 
button

Original comment by derekoli...@gtempaccount.com on 17 Jun 2012 at 1:22

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If you are running Java 7:
1) Control panel
2) Search Java
3) Click Java
4) In Java window, click Java tab
5) View Runtime Environment Settings
6) Disable Java 7
7) Apply

DID NOT Worked for me, running Win 7 64 bit.
UNTIL I turn off my Virus Scanner AVG off
 Thanks for your help!

Original comment by Note...@gmail.com on 6 Jul 2012 at 5:25

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I'm using WIndows 7 32-bit and experiencing same issues.
Tried disabing AVG anti-virus. Tried saving JNP file to new location and 
opening from there.  Tried disabling Java 7. Nothing worked. I have spent hours 
trying to connect to Blocks Editor with absolutely no success.  This is 
extremely frustrating.  Are there any more suggestions?

Original comment by dominic....@gmail.com on 9 Nov 2012 at 2:27

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Win 7 Ultimate 32-bit
Java 7
Chrome 24.0.1312.52 m
AppInventor v1.2

I have basically the same problem. The jnlp-file downloads OK, started it and 
stuck at java's "Downloading application". Like someone else commented.

I deactivade AVG and it works like a charm.

So the question is what is blocked by AVG?
I've put both C:\Program Files\AppInventor\ and C:\Program Files\Java\ as 
exceptions i resident shield. Does not help.
I've put java.exe, javaws.exe and most of the files in appinventor as exception 
for "potentially unwanted programs", but AVG is still blocking.

It's kind of tiresome to inactivate AVG everytime I'm using AppInventor.

Original comment by daniel.s...@gmail.com on 12 Jan 2013 at 9:06

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After disabling separate components inside AVG, it seems to be related to the 
LinkScanner component.
When LinkScanner is disabled and the rest of AVG running as usual, Blocks 
Editor open up fine.
Did a quick search for adding exceptions to AVG LinkScanner, but does not seem 
to be possible.

Original comment by daniel.s...@gmail.com on 27 Jan 2013 at 12:37

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What i did was this:
instead of opening it with Java, i opened it with Javaws, which means java web 
start... 
cheers^^

Original comment by dominicw...@gmail.com on 15 Mar 2013 at 3:42

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#36 dominicw...@gmail.com What i did was this:
instead of opening it with Java, i opened it with Javaws, which means java web 
start... 
cheers^^

Works fine. Tanks!

Original comment by wkulk...@gmail.com on 20 Apr 2013 at 3:28

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windows 7 64 bit
i got it to open last night but i have been waiting 7 hours to get it up and 
running today i have tried everything anyone found the problem please help!!! i 
have done everything in this forum and troubleshooting
and #23 on windows 7 64 bit i cant disable it

Original comment by mikekear...@gmail.com on 15 May 2013 at 9:50

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I had this issue: I have been using app inventor for school and now just use it 
personally as a base android creator. I had not opened the block editor in a 
while, but  today I decided to review some of the assignments from my class. 
When I went to open the block editor, my jnlp file downloaded. I clicked on it 
in my chrome browser, and it told me it did not know how to open the file. I am 
running win 7 x64 and java 7, again this used to work. I read through the 
comments here and the solution that worked for me was to tell the file to open 
with Javaws. find it in C:/Program files/Java/jre7/lib and it is in the list 
here. redirecting the file to open with this immediately fixed my issue the 
next time I tried to open the block editor. Thnx #37. I was thorough because I 
hope this helps someone else. 

Original comment by Brian.me...@gmail.com on 29 May 2013 at 3:31

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I have tried everything described in this post
Remove/ Uninstall Browser and re-install
Try on different browsers (Firefox and Chrome)
Remove and re-install Java
Disable Firewall
Move download location
Try opening directly from download instead of browser.
Remove and re-install App Inventor Software.
Tried opening with both Java Web Installer and Java

Nothing seems to work

I get the dialogue 'Starting application... Downloading Application' and that's 
all.
The dialogue box just sits there. App Inventor Eventually asks me if I wish to 
carry on waiting.

I wasted more than a day on just trying to get the block editor to open...

It was working on this machine a little while back, Windows Updates have been 
applied and other software added or updated.

Whilst typing this I've now got an 'Application Error' dialogue - Unable to 
launch the application.

I've copied the reports from the trace and included them in the attached file.

However I do have another computer for which (so far) I've not had any 
problems, all running the same software (OS, Browser, Java and Internet 
Security / Firewall)

So the only difference (other than they will have slightly different programs 
installed) is the hardware. The computer I'm having a problem with is an Acer 
Aspire 8942G and this is accessing the app inventor over a wireless connection 
whereas my desktop is accessing it over a wired connection...

Original comment by marek.li...@gmail.com on 4 Jul 2013 at 5:45

Attachments:

• [Unable to Load Application.txt](https://storage.googleapis.com/google-code-attachments/app-inventor-for-android/issue-1104/comment-40/Unable to Load Application.txt)

[GoogleCodeExporter]

Following on from #40.  Knowing that it worked on this machine before and it 
works on another machine with a similar software set up...

I thought to try again with my ethernet cable plugged in...

This time success.  

So in essence - doesn't work over WiFi, but does over ethernet.

Hope this helps someone...!

:-)

Original comment by marek.li...@gmail.com on 4 Jul 2013 at 6:49

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I have something like this, the Web Interface works fine, but upon opening the 
blocks editor, the application gets stuck on "Downloading Application", usually 
it jumps straight to "Verifying Application", this is not normal for me, it 
used to work fine, then suddenly stopped working. 

Original comment by daniel-h...@outlook.com on 26 Jul 2013 at 4:02

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I had this error using Linux Ubuntu 10.12 and solved like this:

1 - Open: Applications -> Internet -> Oracle Java Web Start 8
2 - Click on "Settings" under "Network Settings"
3 - Uncheck the box "Allow temporary files on my computer"
4 - Click OK.
5 - Click OK again.
6 - Return to App Inventor and click "Open Block Editor"
7 - A security message will appear, click on "Accept or OK"
8 - The Blocks Editor will open normally.

Original comment by jailson...@gmail.com on 20 Aug 2013 at 1:54

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We have a problem we try to open our blocks editor it won't open and a black 
screen appears and disappears very quickly as it came can you help us.

Original comment by lwtechc...@gmail.com on 3 Oct 2013 at 7:22

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I have Windows 7 64 Bit. 
I tried this but it did not work:
  Comment #23 
   If you are running Java 7:
   1) Control panel
   2) Search Java
   3) Click Java
   4) In Java window, click Java tab
   5) View Runtime Environment Settings
   6) Disable Java 7
   7) Apply
I also tried this but it did not work: 
  Comment #20
   Ok, I solved my own problem...  I can only tell you what I did, I assume it will work on other     browsers.  First, change your browsers download location to somewhere other than the current location.  Second, cancel the supposed opening of blocks editor on the project page.  Try to open blocks editor again.  When the file is done downloading, go to the download location on your PC (the desktop for me), and run it from there.  It would seem to me that each time you tried to open blocks editor, and downloaded the file, it would make a copy as they have the same name each time.  So after looking in my downloads folder, I noticed there were no files marked .jnlp.  Can't open a file that is not there.  If you use Internet Explorer it would even be more difficult to figure out.  IE downloads to a temp folder by default and its not in a easy to find spot on the HDD.  Hope this helps someone.

I NEED HELP!!! Please help me! Whenever i open the blocks editor, it still says 
"Downloading Application" and doesn't respond. 

Original comment by 3300know...@gmail.com on 11 Oct 2013 at 11:02

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I've spent the last couple of days — continuously — trying to open the 
Blocks Editor or try other IDE interfaces.

After I download AppInventor 2.2 and install it, Blocks Editor complains that 
I've somehow downloaded Ver. 1.2, instead, and deems it incompatible.

Was there an error posting the latest version of the installer? Does someone 
know why this is happening?

Many thanks for any helpful replies.

Original comment by Wordhe...@gmail.com on 12 Oct 2013 at 12:25

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i have used app inventor for the first time on my laptop today and when i click 
on the blocks editor the download button appears ,as it does when i save and 
image, then a message comes up at the bottom of the screen saying that this 
type of file can harm my computer and do it want to keep it ? when i click keep 
the blocks editor say : opening the blocks editor ... (click to cancel) and 
nothing happens tried refresh but it just take me back .has anyone else had 
this problem can anybody help ?!

Original comment by megwanwr...@gmail.com on 21 Mar 2014 at 6:37

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Just check if you don't confuse https://appinventortojava.appspot.com (use to 
retrieve java) with (the real) app inventor: http://ai2.appinventor.mit.edu/

(because there is a bug in the first link)

Original comment by carnet...@gmail.com on 2 Apr 2015 at 10:50