Try in mame60 instead. That's what I tested it in VirtualPC(running Win98) on my mac before submitting and it played back fine.
I didn't test it in mame32-60.
It might be one of those that is M$Windows version dependent also so if you are running WinXP that might be why it won't playback for you also.
I finally got around to trying the command line version from the command promt and the inp played back fine. Even with the ini it wouldnt play back with mame32.