Look for an updated Video driver, is the computer a Dell??

>One of the forms in our application contains an OLE grid control, and we've tied the cells' rightclick event to displaying a shortcut context menu. What we're finding is that sometimes some of the menu items on the shortcut are not appearing (i.e. like the option's forecolor matches the backcolor), but they appear once the mouse passes over them.
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>This behavior apparently never happened in XP. Does anyone have any ideas?
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>Jon