Everything was working fine, but yesterday (and still) when I try to login through facebook, instead of a facebook login window it shows the facebook main/home page. I tried disabling (but not uninstalling) various plugins with no success. (installed besides sfc: subscribe2, tweet blend, w3 total cache, wp-plus-one, wptouch, xcloner). Are there any possible conflicts, or could I have misconfigured something (I did make a few changes to the theme, but I believe they were only CSS changes)?
(w3 total cache says the login page is not being cached or minified)