After talking to you about Parental Control becoming inactive for a period following an IP address change I've realised that the DNS addresses you publish are shared, for enhanced DNS as well as Parental Control. It now makes sense that while my IP update is filtering through it acts like an unfiltered DNS.
Remember that people using this service are looking for protection, having that protection disappear for potentially quite long periods is not really acceptable. How long would it take a child to realise that they just have to reboot their broadband router to get 5 minutes unfiltered access?
Really you need a different pair of DNS addresses for Parental Control which responds appropriately when it doesn't recognise the IP address (ie blocks all sites) - it seems really simple!
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