Strange log in Problem

Hey Guys I need some to test this on BlogLines.co.za

First off here is the bug

Customer gets a site at BlogLines.co.za and then pick to have his site at Gym4me.com

SO his site will be test.gym4me.com

Here is the problem If he try to log in to test.gym4me.com/wp-admin he can not log in

SO here is the work around

IF he log in to gym4me.com first and then log in to test.gym4me.com it works.

I have been telling my customers do this but this needs to be looked at with Multi Domains

@WPMU Def my server and website is open to you guys for any testing that needs to be done