I am playing in the ice levels and everytime I walk into certain places the animals as well as interactive machinery (elevatores, switches, ect.) disappear and that I can see are the shadows. i can still see the animals from far away, but once I get closer they disappear. Does anyone know how to fix this glitch and by the way I am using 1964. I get even get this game to play on Prodject64 for some reason.