SWFObject 2.2 doesn't display in Firefox if served through Mercado

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What steps will reproduce the problem?
1. enter object tabs into Mercado banner
2. schedule banner to go live
3. Firefox displays nothing, not even the default JPG. Safari and IE have
no issues

What is the expected output? What do you see instead?
Expected to see the SWF or at the least the JPG but only saw a blank page.
I reluctantly reverted back to standard Object/Embed solution

What version of the product are you using? On what operating system?
SWFObject 2.2/Firefox 3

Please provide any additional information below.

I used Firebug to manually insert the SWFObject JS call and object tags
into  the web page and it worked perfectly. It only fails when Mercado
tries to publish the content as a banner.

Normally I wouldn't post this as an issue but someone else might come
across this and it should be documented somewhere so developers aren't
pulling their hair out trying to figure out why perfectly good code isn't
functioning.

Original issue reported on code.google.com by citznf...@gmail.com on 7 Jul 2009 at 9:49

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BTW this is not caused by the server sending:

Content-Disposition: attachment. 

Original comment by citznf...@gmail.com on 7 Jul 2009 at 9:54

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This does not sound like an actual SWFObject bug, but more of an issue to do 
with 
the server environment as pages not delivered through Mercado work on all 
supported 
browsers.

At the very least, we would need to see a test page which demonstrates the 
issue. 

Original comment by aran.rhee@gmail.com on 8 Jul 2009 at 8:34

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[deleted comment]

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This issue is not SWFObject related.

Original comment by bobbyvandersluis on 9 Jul 2009 at 4:14