I don't use shared userdata tables, but some of my users have had trouble login in after I upgraded from 2.0 RC 7 to 2.1 beta RC 2. A common demnominator is that all use auto-login. It has happened in Safari, Firefox and Internet Exploder 7.

The problem seems to be solved when cookies are removed and the browser is restarted. FYI.

Great work on the script by the way, Alex. Your work is much appreaciated. Keep up the good work!