Some Games Won't Load in iMame.. Is it just me?

[Sonic 1992]

Hello, Don't know if any of you might have picked up iMame while it was in the App Store, but I got it and loaded my most favorite classic roms.

But, no matter what, the following roms won't work, downloaded over and over with no luck:

Moon Patrol
Pac man & Ms Pac man
SF 2
Donkey Kong
Popeye

Any help?

Thank You!!