Gain Ground for Genesis

[Sarge]

Okay, so I've run into something very, very strange.  I've only recently gotten my Retrode, and I've been dumping games and saves left and right.  Other than a few issues, things have gone well.  In fact...  they may be going too well!

I have a copy of Gain Ground that I've never been able to get working on my systems.  I've tried many, many times on various Model 1/2s.  No dice.  However, on a whim, I dump it with the Retrode, and it works?  The md5 and sha1 check out.  So what could be going on here?  Is this potentially a TMSS problem?  I don't think any of my systems are non-TMSS, so I don't have a way to verify.  And if it is that, is there a way to fix it?

EDIT:  I realized this is probably in the wrong subforum.  Should I move it?