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/screen1.jpg

[waynew]

What happens if you do a rePaint() on the dialog?

[wysota]

You are somewhere preventing the events from being processed. Most likely your "thread" is not really a thread and it blocks the main event loop.

[goocreations]

It turned out to be my graphic card drivers. Apparently this happens often with faulty graphic cards (or drivers). But thanks anyway for your input.