I've switched to the latest and greatest 4.6.1 , compiled it against gcc version 3.4.5 and running under windows environment . I found that context menus will be half shown until you move the mouse. Half shown means there is a transparent window but the contents are not painted yet. I've seen these scenario in qt creator too. By the way I recompiled Qt Creator with my toolset.

Is anybody experiencing the same thing?
Is this a bug ?

I did not notice this problem in 4.5's


P.S. I am experiencing a some re-painting issues too in QTabWidget but I think I should focus on ContextMenu first..