On the latest version of Attract Mode, Groovymame is not working properly. When I load a game, the resolution is obviously changed but then it just shows the desktop. If I try alt tabbing to mame, it still doesn't show it. I have an older version of AM that works great with the same groovymame binary so I'm not sure why this one wouldn't work? I've tried all combinations of fullscreen, windowed, fill-screen, etc inside AM.
edit: neglected to mention that I'm using Windows 7.