Samba 3.6.9 upgraded to 3.6.12
Samba joined to AD with Server 2008
After upgrading from 3.6.9 to 3.6.12, shares with security groups are not allowing the user to connect/map share. Alternatively, if you input the specific user, the share is accessible.
Appears to be similar to Bug 9561, though with a slightly different setup.
What log information would you like to see?