I keep getting this error:
Your login data seems too old; please log in to any StackExchange site, possibly logging out before.
I have cleared my cookies, and logged in and out of EL&U several times. I have also closed and reopened my browser (Firefox 3.6.18) with no luck. I have accessed chat with this computer and browser before.
Also, upgrading to Firefox 6.0.2 does not correct the error.