I made a mistake in the retrogame 2 players for Pi2. I modified the ioTFT array instead of the ioStabdard array. As a consequence, no key is sent to the emulators or frontend. This is corrected in the github repository https://github.com/ian57/Raspicade-configuration-files/commit/45cfe6c33127755c31b51aec8b51d82adf8de783 and https://github.com/ian57/Raspicade-Retrogame-2Player-Pi2. Will upload an update soon. Stay tuned

If you don't want to wait the next release, just git clone https://github.com/ian57/Raspicade-Retrogame-2Player-Pi2.git and copy the files in the ~/Raspicade-Retrogame-2Player-Pi2/ directory. It should work.