[Samba] File owner SID instead of name showing for one user

[Gregory A. Cain]

Hello,

I recently migrated all data and user accounts from our old Samba file 
server to a new (Samba 3.4.0 on Unbuntu 9.10) one. Everything is working 
fine except that there is one user whose SID is showing in the "Owner" 
column of Windows Explorer instead of the user name.

It's not a big problem, but the user is uncomfortable with it and I'd 
like to know why it's happening and how to fix it.

Any help would be much appreciated.

Thanks.

Greg