Thanks for the detailed discussion Charlie.

This could be easily fixed by simply removing the 'check-box' from the menu item. The tick in the check-box appears to the user that this option has already been selected, when if fact it has not. Clicking that item then activates the filter and the list updates. There's no need for the check-box on that menu item, and I have to guess that this interpretation is what confused the O/P.

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