I get that to with a twist and then some
can log just fine with FF or IE at main page (https://www.wincustomize.com/) where I have most problems is when downloading or loading a page one moment it work just fine the next it just sits and tries to load or download something and it helps if I login with both FF and IE some times..
and like a lot of us it ONLY does it here on WC oh and it's an EVERY DAY thing or every time.. I starting to think WC is never going to fix their site.
as for logging on this way http://disturbedcomputer.wincustomize.com/skins.aspx it just started to day with FF It will not log me in it takes me to
http://dnssearch.rr.com/?q=login.axd&con=nxd and the kicker is I am already logged on from wincustomize.com but if I go to my site http://disturbedcomputer.wincustomize.com/skins.aspx It don't keep me logged in and if I log out from WC.com and try to log in on DC.WC.com
it too takes me to Road Runner...
oh and disabled all add-ons st will not work cleaned History in both FF IE
not too be mean WC but it's time you finish/fix the new site