[Samba] Stub error changing machine account password

[Mark]

Forgive me if this gets double posted, but I've been struggling with this
Gmane way of using the  mailing list. (A good idea that doesn't work and
results in lots of spam and viruses, but that's another story).

About 3 weeks ago I upgraded our samba server from 2.2.8a on RedHat 7.3 to
3.0 on Fedora.  The samba server is a PDC.  The following error message
appears in the event log on the windows 2000 SP4 workstations:

Changing machine account password for account P2450-2$ failed with the
following error:
The stub received bad data.

The error appears every 2 hours for a day, then it doesn't appear again
(perhaps it will after some period of time, as I said, my 3.0 server has
only been up about 3 weeks).

I understand that the Windows machines try to change machine passwords every
once in a while (I don't know how often), but now it seems that they can't.
Everything still seems to be working in spite of this.  The samba server
still uses smbpasswd as the password back end.

Any help with this would be appreciated.
Mark