samba - Jun 2004 - Cannot access Samba shares with local Administrator rights on XP

Hi,

I've got a strange problem and Google did not help :-(
 
I cannot access any Samba share if I have local Administrator rights 
on my XP machine < access denied >.  As soon as I change my rights to 
something else (e.g. Power user, User), access works fine.  This 
behaviour only affects this one XP machine, all others work well, even 
with local Admin rights.

Any clue?

System:
Samba on SUSE 9.1 as PDC
XP (SP1) clients are domain members

Thanks
Roland