Firefox 4.0 The menus flash like a keyboard key is held down. Can't access them even with all plugins turned off. Same issue on multiple machines with different versions of Windows. How can this be resolved?

FF 4.0. The menus flash like a key is being held down making them inaccessible. The problem persists with all plugin's turned off. Firefox box in top left corner not showing. The old FF logo show there instead.

Turning off hardware acceleration worked in all cases.
With hardware acceleration enabled the menu flashing did not occur on the primary display, only the secondary display of a two-monitor system.
Windows 7, ATI Radeon 4800 series.

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