Website block not working for Virgin Broadband Services

I had setup a block on bunch of youtube urls under Online Security --> Parental controls --> Websites
The block was working perfectly till last week and stopped working since Satureday. 

I have tried setting this up again , rebooted Virgin Media box multiple times and even called helpdesk for help. But not resolved yet.

Its a shame that this block is off right in the middle of summer holidays 😵.

Does anyone else having the same issue ? Whats the resolution ?