(OK, Steve, you're right about the severity...I was mistaken by some comments in the bug log)
Mario, Could you please test the new samba 3.0.20b packages built by Noàl Köthe ? In samba's bug 2776, upstream requests more testing with the new version and got no answer. It would be nice if you could actually test this. http://people.debian.org/~noel/samba/ --