All of my Add-On maps have lost collisions after the "The Contract" update.
Ever since the last major update, all of my maps have lost collisions. They appear, but I just fall right through them. This is an interesting bug, I don't understand what may have caused it.
Since the recent Contract update several MLOs and Add-On Maps are broken.
Try to install updated maps where they solve the error, for now those that give you that error, you must eliminate them.