Comment 2 for bug 697501

This is unlikely to be a problem specific to qBittorrent. I don't see anything in my code that would have this kind of effect.
I could be a video driver problem or something related to Qt, I don't have any clear idea.

However, you should definitely try to use a more recent version of qBittorrent (and confirm this is still happening). You can probably use my PPA for Ubuntu Lucid (https://launchpad.net/~hydr0g3n/+archive/ppa).