hello, when I try to leave carter hydro dam & environs - cave system to winding river the loading screen freezes. this seems only to happen in that direction. i have tried this several times over a week or two with the same result. i travelled from mystery lake to winding into the cave no problem, and even ducked back out to winding river from the cave also with no problem. but several times now when travelling from pleasant valley into the cave, then attempting to enter winding river the screen freezes and eventually i have to force quit. i have a new 21.5-inch i mac 2.8 ghz intel core i5. thank you.