Quote Originally Posted by dictoon View Post
Hi, thanks for your answer. However, please read the thread from the beginning. I'm blocking the thread (and the event loop) on purpose, in order to demonstrate a problem (bug?) that I have hit with Qt.

By the way, just to gather some more stats: have you tried the application demonstrating the problem? If so, do you see the window's background being filled to white before the window's content gets rendered? What's your operating system?

Cheers,
Franz
Yes, I have tried this demo and have this same behaviour as fatjuicymole. After changing sleep method all is working perfect.
On Windows VISTA with AERO background is white, without AERO window have no background. This is a problem with Windows not with Qt.
And in Yours real application You must blocking event loop with some long process.