Created attachment 56369 [details] Screenshot with square Version: unspecified (using KDE 4.5.5) OS: Linux If desktop effects is enabled, I get a transparent square on the desktop since a few versions back of KDE (don't remember exactly when it started - a couple of months ago I think). Disabling and enabling desktop effects makes it go away until the next boot. The square is always there for me. Removing .kde and starting from scratch didn't help either. After a reboot with fresh settings, the square re-appears. I found it described here also: http://forum.kde.org/viewtopic.php?f=67&t=90994 Reproducible: Always Steps to Reproduce: 1. Enable desktop effects. 2. Reboot 3. Log in to your new nice desktop with an ugly square Actual Results: An ugly square appears Expected Results: No square appears