Mihai,

That's interesting, because I had almost the same problem 1-2 weeks ago.
I could use download version 3.5, including access to Preferences. However, when using the installed version 3.4, the program crashed when trying to access Preferences.

This happened immediately after a Ubuntu 11.10 upgrade, so my guess was that they changed something in the video driver that caused the problem. My solution was to format my harddisk and re-install Ubuntu 10.10, which never caused any problems.

Hans