Hi Alex,
I don't know what to say...its exactly the same as before...
1. open Facebook and login
2. open my web site and manually login
3. close browser
4. open browser with my web site - NOT logged-in
maybe its a cache thing ??? am I missing something?
did you check this exact scenario?
Later on today I will check with more PCs and more browsers and let you know. Currently I'm using FF
Thanks for your hard work, I know its a tough bug