Firefox problems

[KKisser]

i've been using firefox for a couple of years but early this month all of a sudden i started having problems with it everytime i try to access saddoboxing.com i get this message:

Bad Request
Your browser sent a request that this server could not understand.

the problem only persist for this particular site. i've tried a few things but nothing worked so far. started using explorer again just for this site and everything's fine. any ideas guys?

[Kev]

It's always worked fine for me until today.

For some reason I can't send private messages today.

I keep getting this message

'Bad Request

Your browser sent a request that this server could not understand.'

Actually Internet Explorer not working for me either.

This is strange as I'm always sending messages, not sure why I can't today?