Interesting backup problem...

Transworld Surf; the hd backup works fine on another xbox, but not at all on mine.
When I launch the game from evoX, it switches to the evox "loading" screen, and after a few seconds returns me to evoX. I deleted the game from my hd and ftped it from the other xbox back to mine. A known working backup, I figured mine might have been bad. But no luck. Same story.
What is different on my xbox that could be causing this? This is the first instance I've run into like this, so I'm kind of at a loss. I really don't care for the game that much, so it's not a big deal that I can't play it from the hd. But it bugs me that there's an issue with my xbox specifically and I'd like to correct it if I can.