I'm having some issues as well. I'm using Samba as a domain controller. I've found when users login that they get an error that there settings won't be copied because it can't find the profile share. The solution for this is merely to restart the computer.

I also have random instances of people unable to access their mapped drives. The solution for this is to dissconnect the drive and re-map it. This is rather sloppy when you have multiple users though.

Hope this helps someone.