The problem has been discussed here ( http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Number=196497#Post196497 ). The new SMB settings and the Win 2k AD is the cultpit. You are the first to post about 2008 Server, but 2008 Server and Windows 7 share similar code bases so this is not that surprising. You might contact microsoft about the patches and see if they have addressed this for 2008.

Please post back if you make any progress.