I have MaximumPC set as my homepage in FF 3.6.15. I noticed this morning that I was no longer (automatically) logged in. I clicked the login, typed in my info, and was told I was not authorized to access this page (even though my avatar showed up with my name like I was logged in). Then the homepage refreshed, but not with me logged in anymore.
When I come to the forums, I am logged in and can view pages just fine.
Just tried it and it works fine with IE8, though. Logged in just fine on homepage on startup.
Just thought I'd pass this along.