window changing problem

[Till Nocher]

Hello,

I use a freshly installed kubuntu 11.04 64-bit on a Medion
 P6620 Notebook with a Nvidia Geforce 220M graphic chip. I have the 
following problem:
Sometimes(not everyday) a few time after working 
with the computer, it is very difficult to change the window, if I want 
to click somewhere outside the current window, nothing happens and I 
have to right-click on the current window, then I can click on a 
window-button in the the task bar and it appears, but this window also 
doesn't response so I have to right-click first on the task bar and then
 right-click on the window I want to use. Now I can use this window 
simple, but if I want to change to another window, I have to do the 2 
right-clicks again.I didn't know how to describe this in 3 words, so I 
couldn't search the forums or
 launchpad really.

I think this problem
 mainly occurs when I use applications that are not coded for KDE mainly
 (like Firefox, Chrome/Chromium and others) so I had the idea that there
 could be a problem with the GTK-design or other GTK-integration 
modules. Turning the desktop effects off doesn't help, I also tried 4 
different graphic drivers(the after-installation-standard-driver, 
nvidia-current, nouveau and the up-to-date driver from nvidia's site). 
Because multitasking isn't funny with this problem, I also installed 
Ubuntu 11.04 as dual-boot which usually works without problems, but in 
one of 30 cases the same problem also happens to Ubuntu after a few 
hours of working(I don't know if it comes from the same). 
This problem really annoys me, because I really prefer KDE.

Does anyone know how to solve my problem or are any logs needed?

Regards,
Till
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