Some info
Firefox V17.0
Addons that might (maybe) cause issues? Nope, no addons at all.
DNS cache, browser cache and cookies have been flushed (Always trying the simple things first)
The sourceforge FAQ says this
Any ideas?Why can’t I login?
There are several reasons why this could occur. First, ensure your username and password are correct. If they are, contact the board owner to make sure you haven’t been banned. It is also possible the website owner has a configuration error on their end, and they would need to fix it.
P.S Wasn't sure where to place this thread, if it is in the wrong place then please move it.