[ubuntu] vnc pointer problems

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http://ubuntuforums.org – I have a Dell Precison M70 on which I updated from 12.04 to 12.10. After that, the unity desktop wouldn't work anymore. I assumed that is was due to the impossibilty of using the proprietary drivers for its old graphic card (NV17GL [Quadro4 500 GoGL]). So I switched to KDE and run it in failsafe mode. That was OK. However I'm having some problems running the vnc servers on it. If I run x11vnc everything is fine. However if I run the regular vncserver, e.g. 'vncserver -geometry 1280x1024 :1', it will work almost everything except when I click on an icon in the panel. For example pressing the le (Hardware)