I have NF set to block the late night hours of my son's laptop but I found out that he is able to stay on the computer simply by changing the time on the PC. For example, if I block the hours of 11:00PM through 7:00AM all he needs to to is, sometime before 11:00PM, change the PC clock to 3:00PM or something like that so he can stay logged in for essentially as long as he wants. This is a serious flaw in the way NF works. Is there anything that can be done to fix this?