For whatever reason, the Gmail Webapp doesn't show a count or a notification that I have new mail. The ONLY time the envelope turns blue is when I'm already in gmail via Firefox. But as soon as I close the browser, even if I have unread mail, the icon turns back to white.
No counter either, which is confusing. I'm a noob when it comes to Ubuntu and linux in general, so I wouldn't know where to begin to try and fix it.