It saying "Welcome TeamEMJ" when you hit the main page? or are you seeing a banner as well?
if you're seeing the Welcome SoandSo box, and getting a popup, then you have spy/adware.
if you're seeing no Welcome soAndSo box, and seeing a banner ad, and you are logged in, then you're browsing the web from behind a broken proxy server. a workaround is to add a "?" to the url in your settings.