[Samba] Problems after Upgrade from 2.2.0 to 2.2.7

[Harald Riegel]

I have had an running Samba 2.2.0 acting as a PDC for Windows NT 4.0 and W2K clients.
After upgrading the Linux-system (SuSE 7.2 to SuSE 8.2) and Samba 2.2.0 to 2.2.7 WindowsNT4.0-clients can't login. 
"The system can not log you on (C000019B)...".
W2K-clients can login!
If I remove the NT4.0-machines from the domain and rejoin them, then the machines are recognised, but the user-profiles are inaccessible.

What can I do?

Harald