I started noticing this after upgrading to F29. It happens occasionally and only when sending a message (I use Ctrl-Enter to send). Right-click on window on the task bar and select close brings up the force close dialog box and saying 'yes' it closes the Evolution main window. 'xkill' which I've come across helped with cleaning up the workspace: omiday ~ $ xwininfo xwininfo: Please select the window about which you would like information by clicking the mouse in that window. xwininfo: Window id: 0x108e021 (has no name) Absolute upper-left X: 176 Absolute upper-left Y: 50 Relative upper-left X: 176 Relative upper-left Y: 50 Width: 1281 Height: 833 Depth: 24 Visual: 0x21 Visual Class: TrueColor Border width: 0 Class: InputOutput Colormap: 0x20 (not installed) Bit Gravity State: StaticGravity Window Gravity State: StaticGravity Backing Store State: NotUseful Save Under State: no Map State: IsViewable Override Redirect State: no Corners: +176+50 -463+50 -463-197 +176-197 -geometry 1281x833+176+50 omiday ~ $ xkill -id 0x108e021 xkill: killing creator of resource 0x108e021 The ghost window can be resized, and it would "remember" the contents of a window from another workspace when I select it, switch to another window in another workspace and return. Anyone have similar issues? -Viorel