Post about your problems under Player Support and not in general discussion, you'll get an answer on it faster. Simply put this is INV300, it has possibly failed to install the new certificate or changed it to point at our servers. Run the Launcher as an administrator (right click and use Run as Admin EVEN if your account is already the computer admin), click Launcher in the upper left, then reset updates, then check for updates. In admin mode it should take care of this.