Apologies for replying to this old thread but I stumbled on it due to having the exact same problem. I was working with a fresh install of LB and RA and just followed the LB tutorial for adding RA to everything. The first platform I brought over was the original GameBoy. I had downloaded the required cores on RA and set up full screen mode but the games wouldn't launch. I pulled over a GameBoy Color rom and that started without issue. With following this thread and the fact that the color game worked I took a closer look at the associated platforms on the RA emulator and noticed that it only had the GameBoy Color listed but not the GameBoy. I added the GameBoy at the bottom of the list, associated the necessary core and bingo.
I hope this helps someone in future cause it wasn't an obvious issue for me.
Retroarch 1.7.3 not working on LaunchBox
in Troubleshooting
Posted
Apologies for replying to this old thread but I stumbled on it due to having the exact same problem. I was working with a fresh install of LB and RA and just followed the LB tutorial for adding RA to everything. The first platform I brought over was the original GameBoy. I had downloaded the required cores on RA and set up full screen mode but the games wouldn't launch. I pulled over a GameBoy Color rom and that started without issue. With following this thread and the fact that the color game worked I took a closer look at the associated platforms on the RA emulator and noticed that it only had the GameBoy Color listed but not the GameBoy. I added the GameBoy at the bottom of the list, associated the necessary core and bingo.
I hope this helps someone in future cause it wasn't an obvious issue for me.