Days after posting this, the door stuck open. I drove it to the dealer with the door open (felt really dumb) and they had to replace the center track. I saved the "bad" part and I can't really tell what broke. It cost $500-something to fix a part that in my opinion should never fail. I did make a complaint with FoMoCo and nothing came of it.
MattsTC, wish I saw your post before paying the dealer to fix this. The center track arm feels rigidly attached to the door. It doesn't seem like rotating that arm is possible.