It's a strange problem. Yesterday I was playing Street Fighter Alpha 3, and I dont know what combination of buttons I did that popped me a black (yes, black, not green) screen, like the Retroarch config screen but black, and just disappeared when I exited the Mame.

I dont know if this is related, but now when I push the button 3 + button 6 I reboot the Mame. Just happens on Mame. If i remap my controller, the same thing happens, and I dont know how to access this black Mame menu to search for some configuration that I did when I tryed to exit the screen.

Any ideas how can I fix this problem? No, the hotkey isn't button 3 or 6.