/b/ broken?

Hi I can browse and post on all boards but /b/, which gives be a '400 Bad Request' error every time, regardless of trying to post text or images, yet browsing is fine.

I've tried deleting cookies, reinstalling firefox, checking for spyware/viruses (there are none). How can I fix this please?

>>5
It worked! Many thanks to you, kind anon. I seriously appreciate your help, would never hanve known how to fix it on my own. Thanks again.