Retropie on Freeplay CM3 - hotkeys?

[kkaminski]

Noob here. Just finished assembling my Freeplay CM3, and everything seems to be working perfectly, except for hotkeys. For example, I have configured the controller, and set the power button as the hotkey as recommended, but it's not working. I'm not able to exit out of a ROM and return to the menu... I can only shut down completely and then reboot. Any help would be much appreciated!