Comment 21 for bug 1453203

The same behaviour here: black screen, with working mouse pointer, ALT-F2 shows the command box at the top, but not able to enter anything. In my case it happened because in the previous session the plasmashell took 100% for a long time, so i killed it and tried to restart with "plasmashell" in konsole. But that only succeeded with "sudo plasmashell". (foolish me)
The next session gave the black screen.
It is related to that specific user, since it is possible to start a perfectly working KDE session for other users on the same machine.
Just a wild idea: Can this be fixed by adding a root user with a working KDE profile and retrying "sudo plasmashell" ?
Or is there any other way to simply reconfigure the corrupted KDE settings, since reinstalling is only the last resort.