unix19

I rebooted and waited 10 minutes, right-clicking system tray icon still shows no checkmark next to "Website Blocking" even though option is checked on Protection tab. And website blocking is not working. Another system I have (same specs) shows the checkmark immediately after the system tray icon appears. What else could be causing the website blocking to not start? Windows XP Pro SP3, Malwarebytes Anti-Malware 1.51.0.1200