Some time ago I attached a beamer via VGA, resulting in the crash of some KDE component or compiz or whatever (window decorations and KDE panels disappeared). Since then, my main panel, where I have the KDE menu and task bar, isn't placed at the screen border, but has some offset from it.
I can easily move it back to the border, but after logout that's always reverted.
I also tried to move the panel to another border (from left to top), after restart it was still at the top without margin. After moving it back left the problem is again here.
How can I fix this (I don't mind to manually edit a file in .kde file, just need to know where. Resetting kde settings is less an option, as I spent some hours to config it as it is now)

The component which crashed in this case would have been KWin.
Can you reproduce the mispositioned Panel under a new user?

bcooksley wrote:The component which crashed in this case would have been KWin.

Can I repair the session "on the fly" by somehow restarting kwin from console in such a case?

Can you reproduce the mispositioned Panel under a new user?

Just tried that. Created new user, logged into kde, moved the panel to the left, logout, login -> panel at the right place. So, no, couldn't reproduce it yet.
If somebody can tell me where the config for the panels is saved, I will take a look and try to find out what's the problem.

The Panel configuration file is called either "plasma-desktoprc" or "plasma-desktop-appletsrc" and is located at ~/.kde4/share/config on a KDE 4 system. If you wish to know the proper prefix to use if ~/.kde4/ is not valid, then run "kde4-config --localprefix" in a terminal.

The command to run to restart KWin is "kwin --replace &" in a terminal window.

The issue disappeared magically yesterday.
Thanks for you info, maybe I'll need it again.