One User can�t print - all others OK

[Anonymous]

my Environmet:
*  a linux-box, debian sarge, with cups-server and HP 1200 (USB), local printing - fine
* first win2k-box, connected via ipp, printing - fine
* second win2k-box, connect via ipp (as Administrator), printing -fine
* change user on second win-box, printing - not possible, message in win
  "printer not found on server, ...", no message in *.log on linux
* create same user on first win-box, printing - fine.
* changed user-name on second win-box, created a new user with the same (old) name, printing - fine.

But i can not delete the non-printing user, my girlfriend is going to kill me ;-). I read all the manuales, tried for 2 weeks now, no success. Anyone an idea, where to search? I think this is not really an cups-problem, but maybe someone had the same problem bevor. I´m tired.

Thanks in advance.

Wolfgang