Re-install VNC server in xbian?

[Nachteule]

Pi already rebooted?
Are you sure that vnc server is running?
Are you sure that your problem is not the client side? (when I use krdc as client I'm always getting black window)

Hmmm, you're making daily image backups and you can revert your changes from snapshots. Why do you think you could break anything?

I would run

Terminal

sudo apt-get purge xbian-package-vnc-server; sudo apt-get install xbian-package-vnc-server

in the first step