Having the same issue with GBA the buttons are working, just not being registered in the games. I've tried remapping and changing configs to no avail.

Here's the things that I've already tested: Continuity - Good Image - Good gba_bios - Good, the games launch and run fine. L and R responsiveness elsewhere in Retroarch - Good Remapping through configuration before entering the game - Didn't change anything Remapping from a gpsp core remap - didn't ...