I have an M720 that is already connected to bluteooth but options will not recognize. it's incredibly frustrating and time wasting. if I do use a dongle, it doesn't remember the device, even though when it shows the dongle it knows that it is associated with this M720. it only sometimes even recognizes it (after being told to turn it off/on), and when it does, then it hangs in the "gathering information about the device". yo, why are you trying to gather information about a new device I just added? what's the point of that screen?