samba - Feb 2010 - Winbind AD authentication problem

It seems I have the same problem that was discussed briefly earlier on this list
in a mail from Kris Kaido. I didn't see any solution, so I'm wondering
if it's considered a bug that needs to be fixed or simply a configuration
error.

To be more specifc; 

I have joined a Win2008R2 Forest/Domain AD with my server running RHEL5.4 -
samba-3.0.33-3.14.el5 without problems.

I can view users and groups in the domain with wbinfo -u / wbinfo -g
Getent passwd also works fine, aswell as 'su - <domainuser>'

But I cannot authenticate users with password, ie login.

wbinfo -K domainuser%password works fine.
wbinfo -a domainuser%password fails on both plaintext and challenge/response
password. See below for output.

Ex;

# wbinfo -K domainuser%password
plaintext kerberos password authentication for [domainuser%password] succeeded
(requesting cctype: FILE)
credentials were put in: FILE:/tmp/krb5cc_0

# wbinfo -a domainuser%password
plaintext password authentication failed
error code was NT code 0x00000721 (0x721)
error messsage was: NT code 0x00000721
Could not authenticate user domainuser%password with plaintext password
challenge/response password authentication failed
error code was NT_STATUS_PIPE_DISCONNECTED (0xc00000b0)
error messsage was: Named pipe dicconnected
Could not authenticate user domainuser with challenge/response

Hi - you manage to resolve this? I also seem to be having these problems.