Log in and out problems

[محروم.كوم]

I am having an odd error where I can't login or logout often.

If I try to login into my site, the page changes and says "welcome thank you for logging in, fiveflat" then goes back to the homepage with a login prompt again.

Other times when I can magically login and I try to logout I go back to the homepage and I'm still logged in...


I don't even know where to start with this one. __DEFINE_LIKE_SHARE__