Right i'll start from the beginning:

Printers mapped by GPP using the local loopback policy, so the printer i setup is a shared printer in the "user configuration" section, and applied to machine OUs

If i log on to a machine as administrator it all works fine, if i log onto a machine as a teacher though i can't set the default printer (it's also setup to set itself as the default) and often in word you can't select the printer even though it's in the list

Removing the printer and re-adding it works, loging off and logging on as admin, then going back on as teacher works, but just starting a PC up and logging on as a teacher is a no go.

Any ideas here? .. ... . . . i ******* hate printers!