Does somebody knows about this bug here:

Flashing cursor causes graphical glitches in the GUI

I've developed an application under Fedora 11 and it works fine. Then I've tried the some under Ubuntu 9.04 (jaunty) and there I have these issue.

I've tried to compile the source directly under Ubuntu using Qt 4.52 and eben Qt 4.5.3, but no change. Then I found out, that the same problem already appears in qt4-designer while changing the name of an object for example.

Any ideas?