I have the same problem. Corrupted save files are over 6 MB.
My latest save now is right after I removed collar, if I go towards waypoint Fort Joy - Square then game just freezes and then crashes. BUT if I go outside of Fort Joy towards Beach waypoint then it's fine and I can teleport to Dungeon waypoint without crashing.
When opening game and loading a save file it takes a lot longer than usually and after that loading any other save files makes the game crash.
Here is one of my corrupted save files: https://drive.google.com/open?id=0B0kFkXbsa-xLZ09vTXg3TXg1TWM
If you go straight to the waypoint then it should freeze and crash.
