I have the same issue too. It worked for a while, but after the last update it will not recognize the G2 controller at all. I also lost all of my settings (favorite folders, video settings) after the last update too.
I've tried everything to fix this. I've uninstalled everything, reinstalled everything, clicked a million things in the SteamVR bindings. Nothing helps. DeoVR simply won't recognize the G2 controller.