About a month ago I upgraded my SME 6.0.1. server to 7.1.0 (and later to 7.1.1. and 7.1.2).
After the 7.1.0 upgrade I noticed that there was a problem when a user tries to log in on a computer (Win XP SP2). If that user could log in on a computer before the upgrade, he/she has no problem logging in after the upgrade. If however that user tries to log in on a different computer (where he/she never logged in before) he/she receives an error message that the username/password/domain controller is wrong (neither of them is, I've tried it several times with different computers and user accounts).
I found a bug that seems to point to rather the same problem (see
http://bugs.contribs.org/show_bug.cgi?id=1550) but it is marked as closed and invalid. So I'm not sure if restoring an old secrets.tdb file (as suggested in the bug report) would solve the problem.
I've also noticed the following strange thing: my user account was member of the (local) administrators on my computer before the upgrade and has a SID starting with S-1-5-21-1104522194-1193420561-.... If I add my user account (or any other user account) to the local administrators group on my computer the SID starts with an entirely different number: S-15-21-1539043980-2491599288-.... Maybe it is related, I'm not sure.
Any ideas, troubleshooting tips would be greatly appreciated!