I can confirm that the MDI bug is gone, but only for non-maximized child windows. As you know, every MAXIMIZED document window kinda merge its titlebar with the application's main menu bar, thus the document icon ends up next to "File.../ Edit / etc." Well, the problem is there now. The icon's background is just a dark square. On a side note, I've been inspecting the random bug I mentioned earlier regarding taskbar buttons and found that the problem is actually related to those titlebars showing system icons (folders, My Computer, etc., not appz). Their alpha channels don't look completely right. Besides, some icons in the system tray (for example, Windows Update)need to be clicked on for their alpha channels to show up. Thanks for all your hard work, WildBill.