In FireFox, I have an issue when loggin in. I will login and then when it redirects me, I am not logged in. I try over and over, it says it is logging me in and doesn't. Then, I clear my cache and it does finally log me in.
I have the same issue all the time. I always find it lets me log in without clearing my cache in Firefox by attempting to 'Post Reply'...no idea why. Those witches again, eh?
We've been having that issue for a while now, so we're well aware of it. Sometimes it helps if you check the "remember me" box (or whatever it is) when trying to login - that always gets me in when it's being difficult.