By Steve Muench on Oct 04, 2012
If you have kids and macs and you use Parental Controls, for the moment don't upgrade to 10.8.2 Mountain Lion, the feature is broken after upgrading. I had to disable parental control completely on my daughters' macs in the meantime...
After hundreds of parents have complained about problems in this discussion thread on Apple's forums, finally the tech press notices:
For the moment there doesn't seem to be a workaround. Ugh.
UPDATE: Apple announced a 10.8.2 Supplemental Update this afternoon that claims to resolve the problem.