I have RTG setup, and AGA is in no use except games. Moreover game was working before, I don't know why it stops working for now (newer WHDLoad?).
I'll try switches, tried already NOCACHE without success. Problem with NOMMU is that You can't use quitkey to back to WB.
Edit: It works with NOMMU switch. And even QUITKEY is working! Only discomfort is warning about MMU settings before game runs.