Funky samba bug

[Dan Coutu]

I'm hoping someone may be able to point out to me the obvious detail 
that I'm clearly missing here.

Here's the setup. I have a Red Hat 9 server running Samba 3. It has been 
working just fine.
A client had their hard drive die in their windows laptop. So, get a new 
hard drive, reinstall windows, try to connect to Samba.

For some reason their own login is not working from this newly rebuilt 
system. Other logins work fine. There is no error message of any sort. 
They get a login popup window when they try to connect to the samba 
shares and it reappears after they enter their (verified correct) login 
credentials. An endless login loop. One thing that seems to be different 
is the Windows user name is now all in capitals when it used to be all 
lower case. So I changed the smbusers file to reflect that with a line 
like this:

djc=DJC

This maps the lowercase djc Linux login with the uppercase DJC windows 
login (I hope.)

I've used smbclient to connect to the server with that person's login, 
no problem. They can connect from other machines with that login, no 
problem. Other people can connect from this rebuilt machine, no problem. 
Only the owner of the machine can't connect! I think it must be a 
nano-Bill lurking inside Windows. :-)

Seriously, is there something with the system's new SID or some other 
detail that I may be missing? The samba logs show the successful 
connections but not the failing connection so they're no help.

Thanks,

Dan