QDialog not closing properly

[goocreations]

I have a dialog popup for the user to select some options, if the user clicks OK, the accept signal is caught.
When the signal is caught, a new thread is created to handle some computations, the program then continuous to run through a progress bar.
The problem is that a gray area is left behind on the screen after the dialog closed (accepted).

I have attached 2 screenshots showing the problem.
screen0 - die dialog before OK is clicked
screen1 - right after OK was clicked

Can anyone help?

!http://foxhat.org/images/screen0.jpg(http://foxhat.org/images/screen0.jpg)!
!http://foxhat.org/images/screen1.jpg(http://foxhat.org/images/screen1.jpg)!

[tobias.hunger]

goocreations: In my experience things like this are caused by buggy graphics drivers. I see this a lot with the free ati/amd drivers:-/

[goocreations]

ok, seems like that might be the problem. Tested it on a different PC and now it works. thank you very much