Originally Posted by
relangford
Sometimes this goes away when you delete all cookies on your computer, and you can access what you needed to get to.
It's far far simpler than this. Refresh (F5) the page once either before or after receiving this error and one can access the desired content. It is surely annoying that it won't just return to a login page (and I also find myself wishing that they would just freakin' fix it), but it is really simple to avoid the problem.
Cheers.