Printers :: CUPS Problem inside QEMU

I have installed DSL from the Live-CD and made a installation on a virtual HD Drive inside QEMU. Everything's working fine except CUPS.

I can install a new Printer using the Webinterface and can view the Printer Settings. But if i afterwards go back to "Administration" or "Printers", the Printer isn't there anymore...

What goes wrong ? Any idea ?

original here.