I´ve some problems with AD (2003 server) it is the first DNS server, and SME is the gateway and second DNS server, but some times when 2003 take more than "x" time to resolve the names SME assumes (obvius is the second DNS).
When it apens i had same problems sincronizing users profiles with AD.
When i shutdown SME the problem dont presist.
Tx
(sorry my english)