after closing kate the processes keeps running in the background. Result is, when you closed your first session, kate doesn't open a second, third, ... GUI session but opens backend sessions. After login again with a new kwin session, all the kate session are restored to the frontend. Reproducible: Always Steps to Reproduce: 1. open kate 2. close kate 3. ps -ef | grep kate you will see the open kate session(s) Kate Version 15.08.3 KDE Frameworks 5.17.0 Qt 5.5.0 (kompiliert gegen 5.5.0) Das xcb Fenstersystem
*** This bug has been marked as a duplicate of bug 354507 ***