Comment 8 for bug 570945

Well.. I should add that I haven't installed the latest Ubuntu updates, which include a kernel and xserver update.

I'd suspect the problem to be somewhere between xserver and the nuveau driver.
(The PC hardware I'm using here is 64bit, while we're using a 32bit Ubuntu versions, due to constraints with the target platform for the C++ software we're also developing here in this team)

OK, I'll report you back after I did the mentioned latest upgrade, but that may likely be next week. -- Thanks