[Samba] Unstable Samba PDC

[Andrew Gaffney]

I set up Samba 2.2.6rc3 (also tried 2.2.4 and 2.2.5 with same effect) as 
a PDC. It works just fine most of the time. But once every few logons or 
logoffs I get errors about not being able to write files because a 
process is currently using them when its updating the roaming profile or 
  a message about not being able to find the roaming profile when 
logging on. This happens a lot less often than the first error. Has 
anyone come across this before?