I think I know what this was. In KDE 4.1.1 several widgets would get black dots when they were focused. I suffered form this bug too. Everything seems to be OK in 4.1.2 though.
** Changed in: kdebase-workspace (Ubuntu) Status: Confirmed => Fix Released -- intrepid: rendering bug on kde4 desktop https://bugs.launchpad.net/bugs/274920 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs