Something not quite right with login
 

I am a little confused what domain the cookies go to when you have your site set up in a subdomain. I have it configured as the cookie path is '/' and the cookie domain is '.mydomain.com'

The thing is, I am logging in/out multiple users to test stuff and some of the cookies seem to go to mydomain.com but others seem to go to subdomain.mydomain.com

and the other thing is, OK I admit, I was plugin hacking a bit but I turned off all my plugins. so this is pure vbulletin. and now I can't log in at the main vb page at all. It says thank you for logging, but then it directs me back to the main page with the login form still in it. luckily I can still log into the cp as god.