So I had it working fine. I have the three bios folders in my system directory, matching .bin and .cue files, and the path is set right. It worked fine for a week or 2 and now im getting the c++ runtime error that you get when there is no bios. is there anything else i can try?
Check to make sure your system/BIOS folder hasn’t been reset somehow. Load up the core but not any content, then go to information > core information and see if it’s still finding them. If not, go to settings > directories and change it back to where it belongs.