The help browser of Wolfram Mathematica is not getting window focus when clicked on it. Clicking links or buttons in the help browser works without the window focus, but copying code from or typing in it doesn't. I can get window focus on the help browser by using the alt+tab or the Window menu though. Switching focus between notebooks behaves normally.

I'm running Mathematica 8.0.4.0 on Ubuntu 12.10. Mathematica is the only software that has this behavior.

Has anyone else experienced this behavior or know a solution to it?

P.S. Question posted on mathematica.stackexchange.com too.