sessions lost
 

EDIT: solution FOUND

it was a problem with going from no www. to www. and the sessions were lost between the 2... *facepalm*

edit: deleted

session_set_cookie_params() will allow you to set the domain that you can use the session with.

Untested but as far as I'm aware you can use .yourdomain.com for it to cover the base domain and subdomains instead of www.yourdomain.com