Need Cookie Help

[kau]

So I setup a subdomain;

subdomain.domain.com

It uses mod_rewrite like this;

RewriteRule ^(.*)$ http://domain.com/forum/member.php?username=$1 [P]

So now users can have this URL for their Profile; subdomain.domain.com/user/

This works with one problem. When you try to click on anything on the Profile, it logs you out.

Now I went into vB settings and changed the cookie to .domain.com but it still does it.

Any help?