drop down boxes disapear until mouse is on top
When selecting a drop box, then mouse over the boxes dissapear
When selecting a drop box, then mouse over the boxes dissapear
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Do you have that problem when running in the Firefox SafeMode?
A troubleshooting mode.
You can open the Firefox 4.0 SafeMode by holding the Shft key when you use the Firefox desktop or Start menu shortcut. Or use the Help menu item, click on Restart with Add-ons Disabled... while Firefox is running.
To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut to open it again.
If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes
The hardware acceleration was the trick. Thanks