Have you used any version of FBAXXX previous to this one? If so, you may want to go to the MS Dash and delete any FBAXXX game save you find there. I've seen problems like this occur when a newer version was installed on top of a previous version without the previous save being deleted. Even if you didn't have an older version it may be worth a shot to delete the save and try again.
Also, try unzipping the ROM on your PC and make sure it's not corrupted in some way. I'd try unzipping it, then re-zip, and then put the newly zipped version on your XBox.