GroovyMame is running perfectly on my rig, love it. I am having an issue with this certain game, Taito's Space Dungeon. It's a vertical game. When I launch it, I get a minimized window instead of going full-screen. I've attached a verbose log to this post. I'm going to look to see what other games have the same resolution to see if the issue happens with them as well.
Other info, I'm running Windows XP SP3, and I tried running the game in horizontal and vertical positions and get the same behavior.