Cant open firefox on second screen on computer with two screens with two graphics cards.

I have a computer with two screens and two diffrent graphics card. One of them is onboard GC and another one is USB GC. I am running two instances of FF and it works fine with 3.6.20 version. But when I update to the latest version of FF either 5 or 6 this does not work. Even if i try to open one instance of FF on second screen on USB GC , I cant see anything> i have to move it to the main screen to see the FF window and will not work on the extended screen. I am using windows 7 pro 32 bit and the screen resolution is set to 1280x1024 on both the screens.
Can you please help.
Thanks.
Regards
PJ

Try to disable hardware acceleration.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If disabling hardware acceleration works then check if there is an update available for your graphics display driver.
*https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers

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Cant open firefox on second screen on computer with two screens with two graphics cards.

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