Comment 1 for bug 377055

Yes, I believe this is something to do with this bug:

http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=247734

However, I'd like you to test the latest pre-release from the PPA[1], to confirm if the issue remains.

[1] https://launchpad.net/~mscore-ubuntu/+archive/ppa
    (be aware, there are no packages for Karmic there, yet)