When d2d is enabled and a window is in the secondary window, menus don't always open properly. Primary window doesn't have the problem. The problem doesn't happen if 2d2 is disabled.
This happens to me too. It looks like menus have problems staying on top and they flicker showing what is behind them. Flickering happens when mouse is moved and sometimes the menu stays visible for a while. Usually the menu is not visible, but menu items are functional and the border shadow is visible always. My platform is windows 7 x64, ati radeon hd4850.
I cannot seem to reproduce this, do you have any more detailed steps to reproduce?
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