All menus have display problem (flash) when using FF on extended desktop monitor

I use two monitors at work. Each time I display FF on the "secondary" monitor (extended Desktop), all menus (normal menu, bookmarks, right click), flashes going from visible to hidden and so on).

I have the same problem. Windows 7 (64 Bit), extended desktop, 2 monitor system. I have AMD HD 4800 graphics card with all AMD updates current as of 12/8/2012.
The drop down menus display briefly (flicker) and then are not visible. If I am careful and know the dropdown line I want, I can blindly select it. This happens only on the second monitor on the extended desktop. If I move Mozilla to the primary monitor the same page works correctly.
Disabling the hardware acceleration and restarting Mozilla resolves the issue. While I can use Mozilla, it is still not ready for prime time using hardware acceleration.
Given that it is the only Browser or applicaiton that has this problem with displaying drop down menus on the second monitor, I would suggest that it is either a Mozilla hardware acceleration problem or Mozilla needs to work with the graphics card manufacturers to resolve a problem that only Mozilla seems to have with their drivers.

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