Thanks for your help. I think actually the problem is not with retrogame but with RetroArch based on what I found below, so hopefully you can help.

I think I’ve gotten closer to figuring out where the problem may be, though I’m no closer to fixing it. I figured the problem has to do with the emulators recognizing the right inputs, so I went to the “Input Configuration” page of EmulationStation (see first image here: http://imgur.com/a/sAxWr).

First off, I don’t know whether I should Disable or Enable RetroArch Autoconfig when I’m using retrogame.

Second, I went to “Start ES-Config” and did all the configuration there (mapped the right inputs) and saved them for RetroArch but that didn’t fix it.

Next I tried “Start basic input configuration” but that option just returned me to this same screen.

Finally I went to “Open RGUI” and I saw this (second image here): http://imgur.com/a/sAxWr. It’s showing me that the Left key is mapped to “Accept/OK” which is the problem I’m having (hitting Left registers both Left and A). However, once at this screen I couldn’t do anything – I tried to press every button on the Game Boy and Keyboard but it wouldn’t let me continue past this page so I could change the controls.

Do you think this could be my problem? How do I change the controls that I see at this RetroArch RGUI page?