I know a few questions have been asked about this, but I have not found a solution (particularly for OS X).
I updated my LG G3 to Lollipop and now
adb devices does not list the device.
USB debugging is enabled on the device. The device seems to be stuck in MTP. Furthermore, the device requests to install PC Programs, but nothing happens when I allow it.
The device hasn't asked me to authorize my Mac for USB debugging, and I cannot find a way to get this prompt.