I've seen this in other threads (at least on Apple's discussion board) and thought I had a temp fix, but it hit again today. When you add aliases to a user in Workgroup Manager, it can/has change the primary shortname for one of the aliases, thereby changing the short login name used for network logins, email login etc. It happened again today. I wasn't able to check my email because it wouldn't authenticate, I looked at WGM, and sure enough the primary (first in the list greyed out can't edit) shortname had been changed to one of the aliases I had added for email purposes, and my original shortname had been demoted to an alias. Does anyone else know id Apple is aware of this? Does anyone had an actual fix?