This had happened to me once in the past, with two different versions of KDE (3.4.x) and Gnome (?). But I could never reproduce it. It just started happening again (3 times in the past week). There is no obvious action to trigger this event. It can happen while I am browsing the web or while my computer is idle for a couple hours. The KDE desktop just vanishes. The panel stays, but the desktop turns to Gnome. Today something of the strangest happened. Half of the screen turned to Gnome, the other half remained KDE. My panels are (and hence the plasma is) still active. The panel on the left is auto-hiding so it is not visible in the pictures below, but that one works too when I bring the mouse pointer to the left side of the screen. Here are two screenshots: On this one I took the screenshot while I right-clicked on the Gnome part of my desktop: http://img292.imageshack.us/my.php?image=mixture1jc6.jpg whereas on this one I right-click on the KDE part of the desktop: http://img509.imageshack.us/my.php?image=mixture2eq0.jpg I am mainly using KDE and switch to Gnome once every couple months (just for the fun of it). Currently I have kdebase-4.1.96-1.fc10.x86_64 kdebase-workspace-4.1.96-4.fc10.x86_64 kdelibs-4.1.96-9.fc10.x86_64 qt-4.4.3-10.fc10.x86_64 gdm-2.24.0-12.fc10.x86_64 gtk2-2.14.5-3.fc10.x86_64 gnome-desktop-2.24.2-1.fc10.x86_64 etc installed. I am not sure where to report this bug. Is this a Gnome bug or a KDE bug or is it something else? This will probably be my candidate for the weirdest Linux bug ever. -Orcan