The bears still move, but sometimes get stuck if there's no empty spot within four squares or so. Also, if you have thick clumps of trees planted along the top edge of the map, the bear will sometimes hide behind the trees so you can't click on him to clobber, but can't chop any of the trees without paying double. I've had that happen to me three different times. (Begging friends to chop the trees and reveal the bear is helpful in that mess, since visitors get five actions regardless where the bear is.)