The Unarchiver has sometimes problems unpacking multiple rar sets

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OSX Yosemite here. Have seen the problem happen in Mavericks too. It is 
dificult tp reproduce becauae many times the process works without any error.

The Unarchiver has sometimes problems unpacking multiple rar sets at the same 
time. Like when you have 10 sets of files divided in multipart RAR files. Every 
set is located in a diferent folder. This is what I am doing:

1. The sets are stored with this structure:
FOLDER 0: Inside it I have these folders:
FOLDER A: Inside it I have the rar files of the A set. All these sets contain a 
single 300mb mp4 file each.
a.rar
a.r01
a.r02…
a.r50
FOLDER B: Same as the A set
b.rar
b.r01
b.r02…
b.r50
FOLDER C:
c.rar
c.r01
c.r02…
c.r50
and so on.

2. I stand on FOLDER 0 and use spotlight to find all the .rar files

3. I select all the .rar files in FInder, right click and open them with The 
Unarchiver

4. The program starts to decompress all the sets in series (this is excelent as 
this does not chocke the hard disk like if you were going to process all the 
rars in paralell).

5. The problem is that sometimes I get an error message telling me that The 
Unarchiver could not finish decompressing a set. It ask if I want to stop the 
operation or continue. If I continue almost all the remaining sets give an 
error.

6. Whe I try again with the remaining sets the program completes the task 
without any problem so there was never a problem with the files.

Original issue reported on code.google.com by davidjul...@gmail.com on 24 Jan 2015 at 6:11

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I have to add that I use a SSD.

Original comment by davidjul...@gmail.com on 24 Jan 2015 at 6:12

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I'm also seen this sometimes. When I drag multiple zips on The Unarchiver, it 
will only de-compress the first one. Very sad as I love how it works.
I'm on 10.8.5

Original comment by gamaud...@gmail.com on 11 Mar 2015 at 2:57