Was this an upgrade from 7.0/7.0.1 or from an earlier version. When the submit button is pushed it does run a javascript function. I believe this has changed a bit, so you may want to close your browser and reopen to make sure you don't have the old javascript library cached.
If it still does it after that, then you may want to check for javascript errors. In IE, you should get a little error down in the bottom left of the browser. If you're using Firefox then you'll want to open up the Error Console under Tools and see if it shows any errors there.
