im stuck early in chapter where you need to turn into olmec and get behind some spikes, pick up the skull and go back but i cant go back over the spikes, when i turn into olmec and walk over them i get stuck on them and cant go any further, i can go back fine and turn back into other characters but i cant go over the spikes with any of them, olmec as i said, just gets stuck on them and cant move past

my last save was on chapter 5 too, so i might be screwed if nothing can be done