The apple2gs driver use 2 different floppy disk drive types (Apple and Sony) My games was running on floppy disk devices3 and 4 (Sony) If some disk images are no booting on floppy disk devices 1 and 2 (Apple), try 3 and 4 (Sony).
Oh, I see. flop1/2 are s6d1/2 and flop3/4 are s5d1/2. The old naming made waaaay more sense to those of us who've used real hardware