A while ago I tried to run a Rondo of Blood rom using the PC engine core in retroarch. It did not work and after I did that I couldn’t get most cores working anymore in RA. Not sure if that’s all correlated or not. Regardless, I deleted my old version of RA, kept all my old roms, reinstalled RA again but with new bios and tried running all my games again. Same result. Only core and roms that work are for N64.
Is there perhaps something else I should consider here to remedy the problem?