From the photos I've seen of the ride, the magnetic brakes retract to release the train. Their normal, power off position is closed, meaning the magnet "sandwiches" cover the fins on the sides of the trains. The brakes themselves can't possibly fail, but they can be left open.
Now, for those to be allowed to open, the computer had to think that station was clear. I don't buy a single bad prox switch because they're redundant.
I think that one of two possibilities exist: Either the ride was in full manual (not sure how anyone would be able to do that), or the programming was totally wrong.
-------------
Jeff
Webmaster/Admin - CoasterBuzz.com
"From the global village... in the age of communication!"