Qt 4.5 beta distorted graphics

Hello,
Today , i compiled Qt 4.5 X11 for my opensuse 10.3 system.When i opened the qtdemo application, there was a surprise for me.. The graphics is distorted; but the other demos work correctly. I am attaching the screenshots of the problem. What may be the reason for that distortion..
Secondly, in the documentation, i couldn't see the QScreen class. Is that class removed?(Editing: Ok, i found it in online docs; but it does not exist in assistant )

Thanks...