PC Engine CD games don't run

I’m having trouble getting PC Engine CD games to run in RetroArch. I can get other CD games to play (Mega CD, Saturn, Playstation), and PC Engine HuCard and SuperGrafx games work too. PCE CD games though just won’t run. I have the syscard3.pce BIOS in the system folder, and I have the system folder configured correctly in the Directory settings screen. I’ve also tried manually loading the Mednafen core manually first, then the BIN or ISO file, but all I get is a black screen.

Is there anything else I can try to get it to run?

I’m running Retroarch 1.3.4 on Windows 10.

You MUST load the .cue file instead for mednafen cores. Make sure you have a good .cue sheet, mednafen is case-sensitive.