Not a new problem, but an increasingly troubling one, the traditional solutions don't work. In the past, open space saved bears from becoming threatening pests. They could be moved, or they moved along on their own as humans left parks at the end of summer. No more. The Rocky Mountains are a year-round vacation land and there are no safe places to relocate troublesome bears. Parks try, but it rarely works.
Also rarely succeeding are aversive conditioning techniques like giving bruin a sting with rubber bullets. The drawing power of human food seems to be stronger than any humane aversive conditioning.
Once a bear becomes conditioned to human food it's too late to help. A so-called "problem bear" can't be fixed; it must be prevented. And the only way to prevent it is for every single individual visiting the park and nearby areas to be scrupulously stingy about letting bears have any human food.