Thanks, came just at the right moment.

@zehjotkah: Could you please add this piece of information in the start post of this thread?

(The -rfull parameter is now default with SMM 10, ie. SMM 10 runs in full screen mode without task bar on top. If you want to switch easily between applications, you have to remove this parameter from the corresponding line of the .desktop file. Alternatively you can press the camera button each time you need access to the desktop. This opens the "open cover" message. After closing the message, the task manager is shown.)