I'm asking you that because I'm sure of entering my good username and password.
It was rolling like a charm yesterday evening...
Maybe that has the same cause as the error I've seen few times - sometimes when I click on my wallet, nothing happens, but when I clear browser cache, then it starts working.
Try clearing the browser cache (in Firefox it is Edit -> Preferences -> Advanced -> Network and press "Clear now" there) after logging in, I guess in some situation there are some data from previous unauthenticated state (before you've logged in) that are messing with some functions, or maybe incorrectly returning you back to page from where you've logged in.
I have try this, but it doesn't resolve my loggin problem...
I have changed my password yesterday evening when I heard the site has been hacked... My password is written on a paper leaf, and nobody entered in my flat...
Well, I have nothing else to do then waiting for a forgotten password method...
I Hope soon enough mean today or tomorrow...