Modification Form doesn't detect logged user

I have searched and could not find the answer. The problem is the modification form does not detect that a user is logged, and it displays out a ‘Create Profile’ form instead of the modification form.
Here is what I have done so far but problem is still there.
– I have disable all plugin, switched to basic wordpress theme.
– I have also uninstall apc, memcache from server.
– WP super cache is disable.
– Server is using google pagespeed service. However, I don’t think it is the cause of the problem. I flush the cache every time.

Ohh and WP recognizes that the user is logged in. All the condition like ‘current_user_is(“s2member_level1”)’ works too.

I’m having a similar issue, the checkout form no longer recognizes that a user is logged in and displays a ‘Create Profile’ form instead of an update profile form.