Just updated the servers to 10.3.1 and now the Windows XP 32 bit workstations. On reboot all seems fine apart from GroupWise 8 SP1 can no longer login. On login attempt it shows an error:
An unexpected error has occurred...

It doesn't seem to effect the GroupWise 7 client.

Reinstall of the GroupWise client seems to fix the issue.

I have opened an Sr with Novell.