Hi,
first of all i would advice you to ask in another news group dedicated to samba:
comp.protocols.smb
You might find more help there.
Regarding your problem i have no solution for you. But any it seems like the
server power-down could have crashed some run-time databases of samba and this
might cause the trouble. All machines that were not logged into samba when
the crash occured might not suffer from this issue, since there have not been
runtime-entries for them when the power failed.
I'm not fimilar with sambs interna's so i can't name any specific file.
Although i think it might be raelted to some file locking.
You should also consider the installation of the last samba release (see
www.samba.org) to gain from some bug fixing.
AFAIK there has been an issue between a newly M$ security update for XP, 2k and
the likes and samba which is addressed only in the latest releases.
If you want to stay with the 2.2.x code base there is also an update
(i think 2.2.9) which you could use.
HTH
Ralf