samba - Sep 2008 - invalid username error when accessing a share causes delay (but works...)

Hi,

(thanks to V. Lendecke and W. Ratzka who helped me with my previous question)

I've decided to set-up Samba using ADS security and it works fine.  The only
thing is I have a 5-6 seconds delay when I access a share the first time after I
login.  The delay occurs again if I've been logged in for a while but
haven't gone to to the share and then try to access it.  Everytime this
delay occurs I get this message in a file named SERVER_NAME.log under the Samba
log folder

 "Username REALM\SERVER_NAME$ is invalid on this system" where
SERVER_NAME$ is the name of the server from which a user is connecting to the
shared folder and REALM is my realm specified in the smb.conf file and my
krb5.conf file.

I've googled this but only found the information below:

This usually happens when a non unix-enabled account performs a network browse.
It is often a workstation account, appearing as DOMAIN\HOST$. The account
successfully authenticates itself to the samba server, but there is no UID
associated with it (as it's not VAS-enabled). The messages are harmless, and
indicate that some of your shares can't be accessed by non-unix enabled
users.
To remove these messages, do ONE of the following:
1 - specify "log level = 0" in smb.conf. This will hide those
messages.
However, I'm worried setting log level = 0 will prevent useful messages from
appearing in my logs.  Does someone have any idea of what the best course of
action is?  Let me know if you need any config info.
Thanks!
FJ