All is ok for All to River, but if you select FrozenOcean (the next is FrozenRiver, then it's Ice Plains), then return to the Customize menu : it will select Ice Plains.

So if you select Mesa, il will select Mesa Plateau when returning to the Customize menu.

After all, if you select Mesa Plateau F or Mesa Plateau, it will crash when clicking again on the Customize button : http://pastebin.com/NnYXu3n7