Problems logging in with Firefox

Hi

I’m trying to log into this website with Firefox:

http://www.knitthecity.com

When I type in my password and username it just redirects to the same page with no error message. I have cleared the cookies for this page, and also cleared the cache and history.

It still does the same thing.

Oddly I can still log into my other wordpress account which is run through the same host and on the same server.

Please help.