Login broken?

Hi WordPressers,

Since this morning my login page is all screwed up. Whenever i enter my admin login, or use the social connect plugin to log in via facebook, the page just reloads without me loging in. I already checked this with a different connection, but it seems i am not locked out. My mobile device was still logged in, and i can reach the admin panel from there for now, but i would like to fix the login page so i can continue working on my computer.

My plugins are:
– 404-redirected
– admin bar disabler
– akismet
– better wp security
– easy wp cookie popup
– google sitemap generator
– header footer
– limit login attempts
– theme my login
– ultimate maintenance mode
– w3 total cache
– wordpress seo
– wordpress social login
– wp hide dashboard
– wp modal login

I changed nothing over the night and yesterday it worked like a charm. What could have went wrong. Oh i also have to note that for some reason, one of my plugins (most likely better wp security) has created a setcookiewpprotect.php and edited the .htaccess file. I already reverted this. Please help! Thanks in advance!