I get the same warning, blocking all links to the co.cc (I can no longer get through the the forums using the old domain name), and it also takes to making all the images those invisible things with the little red crosses, which is a bit of a hindrance when trying to make sure the Buff/Nerf sections have/the right/images.
Any way to bypass this without completely changing the security/broadband settings? (not really my place to interfere)