[Samba] Samba + Vista SP1 usernames with @ not working

[Andrei Mikhailovsky]

Hi

I was wondering if anyone came across an issue with Vista with SP1 and
usernames that have @ in their usernames (example username at domain.com).
The login to samba network stopped working once i have installed SP1.
The message I get is:

The local Session Manager service failed to logon
The data area passed to a system call is too small

>From the server side i don't really seen any errors and the same
username on pre SP1 workstation works without problems. Googleing for
the problem does not show anything useful

Thanks for any suggestions

Andrei