Having some major log in and log out issues

[TradingApples]

Hi,
I recently installed VBulletin and am having an issue where when I log in and click remember, it takes me to the page saying "You are now logging in" and then takes me back to the home page but shows me as not logged in. Then if I click on any link, it will show me as logged in.

I changed the setting in Admin CP => Options => Cookie Options => Cookie domain from "Blank" to "mysite.com" and now this solved the log in issue but created a new issue: Now I cannot log out no matter what I do. If I click log out, it says "You Are now logged out and all cookies have been cleared" but then if I go back to the homepage it shows me as logged in again.

Any ideas? Thanks in advance!