Since a few days I'm having quite a strange problem with my KDE4 desktop. I have a notebook screen at the left and a big screen at the right as shown in this picture:

Whenever I click in the black area underneath my notebookscreen, my first "page" switches to the mode shown in this picture:

By doing some things like changing the page with the desktop grid, eventually my notebook screen goes back to normal. Logging back in fixes everything for a while. Note that the second picture KDE doesn't seem to show any plasmoids and is just showing the content of my deprecated ~/Desktop folder.

I started seeing this after I installed a dropbox daemon (which is totally handled by KDE. I've put a link to it in the KDE autostart folder.)