We have a Mac Pro work computer in my stepson's room that he is allowed to use. I have strict time limits on computer use for him, 3 hours a day during the summer holiday. Today I felt he'd been on the computer all day long, so I went to take a look and the timer (under the clock in the menu) still ready 2 hours 58 minutes left, which is far from correct. He is only 10, autistic and does not have the knowledge to hack his way past the parental controls. Anyone else experienced this issue or know a solution?