RetroArch not working on Ouya

Hi, I installed RetroArch from the Ouya app store last night. I’ve been unable to load a single game— I select the core for the console I want to emulate, select the game, and then get taken to a black screen with “Port 0: Ouya Controller” in yellow text. I have to forcequit the app.

This happens with every core and every game, and also happens if I select my rom from the “load content (detect core)” option. Bear in mind that all of these ROMs are working in other emulators just fine.

The ROMs are stored on a 64gb flash drive, and not on the Ouya’s HDD— I don’t see why that should make a difference, but I figured I’d mention it just in case. Please help! RetroArch seems like it will be awesome if I can just get it to run a game!