This is what I heard from applicants. The match occurred in January as expected and everyone got their program assignments....THEN, 6 programs (most of which were highly competitive programs) indicated that they didnt get any residents. I am not sure the reason...it may be a simple computer glitch, or maybe the programs were cocky and only ranked like 5 people.....who knows. Regardless, these programs were not expected to scramble for unmatched applicants.
So the applicants in the match were contacted and told that their assignment was retracted and that a new match would be held. A few days later, applicants were given their actual position. In theory, it should have helped all parties, since people would all have been bumped up to a program higher on their rank list. I talked to one person who was told he did not match, and then found out 3 days later that he did match. So it was stressful but should have worked out pretty well in the end.