Hi,
I am experiencing a weird UI issue. the buttons at the bottom of windows are all truncated! This also includes installation wizards. This makes the application quite hard to use of course since I need to guess each button does what

This is on Xubuntu 12.04, using the PPA as described on http://www.playonlinux.com/en/download.html. I don't think this is something specific to a particular GTK theme because I tried quite a few and the issue remains. Any idea what's wrong?
Thanks