Can you let us know what you think caused it?
Also if it's something you can replicate? For now... we recommend going back to a previous save!
Hmm i cant be sure XD i wanted to see what kinda bad end the purple flowers gave me in the swamp, but once i was back in my camp i couldnt run anymore,. i did go to the shaman to get all the rubber gear and things taken off my dude but even naked he cant run anymore. sadly i was dumb and only kept one save :P but will start a new game.