I'm having a problem with a Google Analytics Tracking cookie. When users click off a promotional email we send out the site will load fine, but if they click off the initial page that was loaded they get a "Bad Request" message and the server logs a 400 status code. This only happens in Firefox and Chrome. IE works fine. If you clear out the __umtz cookie (which is set by Google Analytics) in your browser the page and site will load fine. I pretty sure I've reached the end of the internet googling this problem but can't figure it out.