Thanks to a tip from Bledos, I found the issue with large cities was operator error on my part...
For example
L.O.N.D.O.N
List>
Then choosing:
>London makes everything grey out and become inoperable.
It seems >London is no longer valid as a city but is sort of higher level directory (hence the > next to it) that contains everything starting with London_ so it looks like...
London>
London Airport,
London Stanstead Airport,
London, Greater London
Do not choose the top entry London> and it will work.
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