I had something very similar with a small mouse I had plugged in. I still don't know why it was doing that but a full sized wireless mouse worked fine so I use that when I need a mouse. I would have to unplug the mouse every time I needed to switch windows. I didn't try it with Ubuntu. Damon <div class="gmail_quote">On Aug 27, 2011 2:00 PM, "Waleed Hamra" <<a href="mailto:kubuntu-users@whamra.com">kubuntu-users@whamra.com</a>> wrote: > On 08/26/2011 08:40 PM, Till Nocher wrote: >> 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 >> >> > > i used to have that problem, but maybe once every couple of weeks. after > upgrading to KDE 4.7 it's happening every single day every single > hour... that and a large number of hard-to-explain annoyances happening > in the task manager applet and in plasma in general. > glad if anyone can offer any advice here... > > -- > Waleed K. Hamra > Manager of Hamra Information Systems > </div>