Joy Mapping Stop = “J1B0/B3” in mupen64plus.cfg, but it doesn’t really matter what I change it to since no button combination is working. Those same buttons work perfectly to quit Retroarch and they worked without issue in Retropie 3.3
Edit: It seems when I launch a game it’s automatically reverting my mupen64plus.cfg back to default. I tried changing the Joy Mapping Stop = “J0B0/B3”, saved my changes, and re-opened the file to make sure the changes saved which they did. I then launched a game and once at the main menu of the game, I checked the mupen64plus.cfg file and it had changed back to J1B0/B3. Not sure if this is what’s causing the issue or not.