Why does skype crash with a QWidget fatal error?

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http://askubuntu.com – Some time after a recent upgrade skype has stopped working. If I try to launch it from a terminal, it outputs the following error: ~$ skype Fatal: QWidget: Must construct a QApplication before a QPaintDevice Aborted (core dumped) I have tried removing the .Skype folder and reinstalling, it solves the problem for a while. Nevertheless after I reboot the PC, the problem comes back. Is there anything I can do besides reinstalling to fix this? I am running skype on 64-bit precise using the 3.2.0-30-generic kernel. (HowTos)