The auto tranny thing is strange, but as I understand it is this:

If you are stuck in the snow or something, and you are trying to 'rock' your way out with going from R to D, R D R D R D R D etc. for something like 20 times, it will lock out reverse completely and the car will not go back into reverse again. The fix is a quick update of the software. Kind of cool they can do that, but who the hell figured out this circumstance anyway?? I always thought that was a really bad thing for a tranny to go through.