Wireless Mouse only works with USB hub
I have a brand new mid-2012 Macbook Pro i7 15", which I bought on 12-23-2012. I was using my bluetooth mouse but the secondary button wasn't working accurately in one of my applications, so I switched to my trusty Microsoft Wireless Mobile Mouse 4000. When I plugged the dongle into the USB 3.0 port, I got an error that said my laptop keyboard needed to be identified (?!). I couldn't get it 'identified' until I turned off my Bluetooth option. When I did that, both the mouse and the internal keyboard played nice.