Playlists not detecting cores?

I’ve downloaded the Genesis Plus core, The Mednafin Playstation core, nestopia, and snes9x. I scanned directories containing roms for the cores but only the SNES one works. The other playlists that were generated by the scan tell me “no cores available”

However, if I manually load the core and then load the rom via “load content” it works fine.

How do I make my playlists recognize the cores I have installed?

Go into Directory settings, Core Info Dir and set that to the info directory inside your RetroArch directory.