Menus flicker in and out of visibility on my second screen, OK on primary

I recently downloaded Firefox 4.0 beta 8, and it is behaving oddly. I have two screens set up to be used side by side. When I have firefox on my left hand screen (primary and analogue) it works fine. On the right hand screen (digital) the menus do not behave properly. For example, when I click on any of the choices under firefox root menu the submenus appear briefly and then disappear though if I move the mouse over the right spot and click, the correct action still happens. I have a toolbar with my more frequently used bookmarks and the same thing happens with those menus. My primary screen is a Samsung Syncmaster 712 and the second is a Dell ST2410. My video card is an NVIDIA GeForce 9500 GT driver version 258.96. I am submitting this note using the older firefox since the menu issue makes it hard for me to use the new one. The troubleshooting info is thus from firefox 3.6, not 4.0

https://support.mozilla.com/en-US/questions/772569#answer-125554
Solution for this problem fixed menu flickering for me (Vista 32-bit)

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