SWF move 1 pixel on the right in Firefox when loaded in the xhtml page

Hello,
I have a background image in a level in my swf wich have to be aligned to the background image in the xhtml page where the swf is loaded.
I noticed that in Firefox (Since few time not always) when the swf is loaded, it seem that the image move 1 pixel on the right and the alignement of the background image is ruined!
This thoesnt happen with other browsers like Explorer, Opera, Safari.
I post the difference beetween the firefox and other browsers:
I suppose is not a CSS matter but in the SWF player becouse since some time ago it worked good in Firefox too and i didnt modify anything in the code!
Best regards,
Massimo

Does that happen with every image or only on specific websites?
If only on specific websites then please post a link then we can check it.
Your above posted system details show outdated plugin(s) with known security and stability risks.
* Shockwave Flash 10.1 r53
* Java Plug-in 1.5.0_06 for Netscape Navigator (DLL Helper)
Update the [[Java]] plugin to the latest version.
*http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)
Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/

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