Hi all, I'm running the latest version of Groovymame and crt_emudriver on Windows XP through a J-Pac to a Hantarex Polo 25. On the vast majority of games, it looks great, but with Bombjack it doesn't display properly. It fills the screen vertically, but is only about half as wide as it should be horizontally. Pic below:

All other vertical games display correctly, it's just this one that comes out like this. Any ideas what the problem might be?