Hello, Guinea Pig speaking here!
/ The situation now: after 2 restarts the situation is back to normal, SSC minimized to the tray. Not visible on screen.
I think that this situation with SSC. has happened when I cleaned my computer: I did a clean-up with: PC Tools-Spyware Doctor + Registry Mechanic, I cleaned with C-cleaner, Ad-aware, Spybot, ATF-cleaner. After that I had the mentioned 'problem'.
Now everything is fine. I'll keep you posted when I do a (big) cleaning again but that will last sometime because I'm going for a summer-holiday next week.
Bye for now. And Thanks for the help.