Parental Controls not limiting time any more (Snow Leopard)?

It looks like the latest update to 10.5.7 seems to have broken OSX time limits in parental controls. Several reports are emerging: https://discussions.apple.com/thread/2018656?start=0&tstart=0 http://mac.bigresource.com/OS-X-Parental-Control-Time-Limits-Broken-in-Snow-Leopard–J67KN3EAv.html http://forums.macrumors.com/showthread.php?t=790056 But this is an example of a much older report (last year): http://forums.macnn.com/t/370370/parental-control-time-limit-not-working