Does it show as ON again when you check the WebSafe apps page? If so, have you tried making the change in another web browser? Reboot your device and hub after making the change just to be sure the change is fully picked up upon on your end.
If it shows as OFF, have you rebooted your device and the hub since making the change? (this is sometimes required to be done in addition to making the change in the WebSafe apps page.)
If you've tried all of the above, a member of the Forum Team here could get the WebSafe settings corrected on your account. One of the team will respond to your topic in up to three days.
- - - - - - Any opinions expressed by myself are entirely my own and do not represent Virgin Media in any way.