I have two Joomla 1.0.8 installations that were recently upgraded via .9 to .10. Both run fresh Community Builder 1.0 installations as their only 3rd party add-on with the CB login module. The bug has happened in all of these three releases, so it doesn't seem to be fixed.
Now - in both cases - I'm experiencing the "double" login bug at random. I attempt to log in as "admin" via the frontend (nobody else is logged in) and nothing happens. No user menus, nothing. Then I try to log in again, and I'm in. Mostly, I succeed on second login, but right now I can't seem to login at all with admin credentials in IE6.
There are no apparent changes in the URL as reported elsewhere. No issues in the backend.
The bug happens both on IE6 and FF1.5.0.4 (WinXP with SP2). Remote server is running PHP 4.4.1, MySQL 4.0.24 on a Debian shared host. Safe Mode is on. Session Authentication Method is Level 3. Cache is on, 900 seconds. I never allow my browser to store passwords and the "Remember me" is never ticked.
Cheers
Ford

PS : sorry I can now see that others have posted this issue in the same forum. Forgive me.