QT Designer 3.3.8b redraw problem

Anybody ever encountered a problem with QT Designer 3? It seems cannot redraw correctly. Some kind like doesn't refresh. For example, if I scroll down the text edit and then scroll up again. It will be occurred. And many others.

I am running Compiz Fusion on Kubuntu Hardy 8.04. Is there any problem on that? Is there any way to fix this bug? I know in QT Designer 4, the problem has been fixed. Is that possible to use QT Designer 4 but using QT 3 libraries?

I had similar problems with Qt 3 Designer and they were caused by X server and/or graphics driver.