samba - May 2004 - Attempting "Run As" = Failed to unmarshall NET_Q_SAM_LOGON

I run a Samba 3.0.2a domain controller under Solaris X86, with
a Windows 2003 server computer joined to the domain.  I am receiving
a problem when I try and schedual a task (using Task Schedular), and 
using the "Run As" feature.  I attempt to put the user DOMAIN\user
for "Run As".  Windows reports the error "0x80070005: Access is
denied"
and when I check Samba's logs I see:

[2004/05/21 12:34:19, 0] rpc_server/srv_netlog.c:api_net_sam_logon(201)
  api_net_sam_logon: Failed to unmarshall NET_Q_SAM_LOGON.
[2004/05/21 12:34:19, 0] rpc_server/srv_pipe.c:api_rpcTNP(1531)
  api_rpcTNP: NETLOGON: NET_SAMLOGON failed.
[2004/05/21 12:34:19, 0] rpc_server/srv_netlog.c:api_net_sam_logon(201)
  api_net_sam_logon: Failed to unmarshall NET_Q_SAM_LOGON.
[2004/05/21 12:34:19, 0] rpc_server/srv_pipe.c:api_rpcTNP(1531)
  api_rpcTNP: NETLOGON: NET_SAMLOGON failed.

I also have a Samba 2.2.x domain controller on another network
with a Windows 2000 server.  I do not have this problem when attempting
this.  Im pretty sure my windows side is fine.  The user I am attempting
this with is in Administrators group, and can login to the system just
fine.

Thanks for any help.

-- 
Jennifer Zynn
Sys Admin
Center For Communications Research