Auto redirect on login.php ?

[MasJ]

Hey guys - going pretty much nuts with this issue. I have the same forum - lets call it FORUMX hosted on 2 different domains. One is:

FORUMX.ORG

the other is:
FORUMX.ANOTHERDOMAIN.ORG (for legacy reasons..)

Now as is the case this kind of setup always poses the usual cookie issues for login/logout.

I modified the vbsetcookie() function to set a cookie for the new domain. However, for some reason a request to: FORUMX.ANOTHERDOMAIN.ORG/login.php always ends up getting redirected to FORUMX.ORG/login.php -- this obviously fails because the cookie can't be set on another domain.

I didn't have this redirect problem with vbulletin 3.6. I'm unable to find out why this is happening or even locate the code for it. Any pointers would be appreciated! Thanks!