Hmmm... something similar to this bug has come up before. There seemed in that case that the repair priorities were not being respected. That issue was never really resolved to my satisfaction, so I’m interested in your problem.
Some questions: What was damaged, and on which ship and how many ships? What priorities for repair have you set? Are you sure noting at all on any ship was repaired from turn to turn? You didn't reduce repair efficiency in race setup to the point that no repair bay would ever function, did you?
Click here for that old thread: