A month or so ago, I got the inevitable Red Ring of Death so I was forced to send my XBOX back to Microsoft for repairs.  Just so I could still use my old XBOX Live account and keep in touch with my online buddies during the repair, I removed the hard drive so that could connect it to a friend's XBOX while he was a way and use his just like my own.  Everything worked perfectly, but when I tried to replay Braid, something strange happened.  The game is listed as being on my hard drive, but trying to play it brings be back to the very start of the game as if I had just downloaded it.  For a time I questioned whether or not I accidentally deleted the game and left the demo on the XBOX instead.  Still, I didn't think much of it.  It sucks, but I had already completed the game, so I decided not to worry about it.  
 
Well, now that Shadow Complex has been released for download on XBOX Live, my Braid save file's fate has left me a bit unsure about whether or not I should rush out to download the new title.  Today I came up with a theory that maybe some sort of lock prevents purchased downloadable games from being played on XBOXs besides the ones on which they were originally downloaded, perhaps to prevent sharing.  This seems does not seem likely, but since my repaired XBOX is only days away from arriving, I don't want to download Shadow Complex only to have it not work when I take the hard drive back to my own XBOX.  
 
 Is anyone aware of such a system, or was my experience with Braid just some sort of fluke?

ummm so yeah I dont know what happened to your Braid save file but I have a friend and i take my 360 hard drive to his place and play Splosion Man and we start right from where we left off every time i do know u need to be logged into xbox live before you play your arcade titles but yeah just make sure its your account and your logged into live i dont see a problem.