Traveling to lots boots back to map/crashes (no Error Code)

Several of the lots in Oasis Springs and Willow Creek fail to load. Many times the load fails on the plumbob loading screen and boots back to Manage worlds, at which point I cannot load any lot until I restart or the game crashes instead of booting back to Manage Worlds. I originally noticed the problem in my current game, tried it in a new game and the problem remained.