1.3.4 Refuses to Load 8-bit, 16-bit games

I can load games on the Mednafen PSX core, and the mGBA core. Anything else, Super Nes, Genesis, NES, Master System, Arcade games, results in a crash and the message “Retroarch.exe has stopped working.”

My OS Is Win7 Professional, and I recently switched back from an Intel GMA 4500 GPU (an Integrated) to an Nvidia 8400 GS GPU (Dedicated PCIe). So that, I think is what caused it, but I don’t know why, because this GPU had no problems running these games in Retroarch before.

Is it some setting on my Nvidia Control Panel? Is this a known issue? Is there anything I can do?

I deleted all core specific configuration files and started over, and indeed that fixed it.