I have an interesting problem along these lines. My bookmark takes me to the FSM mainpage. I always have to log in there. No matter how many times I do, It still asks for it. Basically, a continuous loop. I've reached the point now that, at the main page, I don't enter it.
The forum page however, seems to be independent from the main page. I can enter my name and password there and it remembers it as long as I don't enter it from my computer at work. In otherwords, the cookie on my computer at home and at work are different, therfore, I have to relogin on one computer if I logged in from the other. Which is normal I guess and makes sense.
My issues at the main page however occurs on both computers and never accepts my login. Even if I delete the cookies and enter them manually.
Not sure what the deal is with that.