Version: 1.11.90 (using 4.2.85 (KDE 4.2.85 (KDE 4.3 Beta1)), Kubuntu packages) Compiler: cc OS: Linux (i686) release 2.6.30-020630rc6-generic Since using the Beta 1 the kmail main window tends to disappear. Meaning the composer windows remain while the main application window sometime is just gone without having closed that window. The only way to clearly reproduce this behavior is when login out and login back in again. Before login out the main window was there, when login back in only composer windows are there. But actually I do not believe this is a session management problem. It is just the only reproducable version of this behavior. I have tried watching the kmail window for a while but then of course it would not disappear. It was suddenly gone while I was doing a lots of different things besides Kmail.
This bug is still present in RC3, but now only related to session management after reboot / new start of the system.
Bug stil exists in KDE 4.3.1
Bug still present in KDE 4.4. RC2