Problem with www subdomain

[CK13]

When i try to access my site through http://www.hentai-ddl.org i get a blank page, it works fine from http://hentai-ddl.org.
I am using cloudflare, this are the DNS Settings:

and in kloxo:

 

[CK13]

Solved.
Problem caused by better WP security plugin, reactivating the plugin solved the problem.

 

[CK13]

Seems like the problem is not with better WP security but with the caching plugin W3TC.
Whenever i clean the cache the problem disappears and after a while it comes back.
I'm using apc for caching, could that be the cause for the problem ?

I have no idea what could cause the problem and it's really annoying.