It looks like the auto-login feature doesn't work for me (on Firefox 3.6.9). I've just had to re-sign into each site individually.
Also, chat is giving weird messages and inverting the order of the messages (probably related), like so:
Why did my last comment supercede the first one? - parsererror - retry / cancel
What is that verbiage that just followed my last comment after fail about? - parsererror - retry / cancel
Looks like auto-login is a fail. - parsererror - retry / cancel
Here's a pic of a site not having me logged in, after signing into five other sites and hitting the 'Questions' button.