
From the FAQ, number 3.22
Q: Suddenly my "Allow ..." commands are grey and disabled. I cannot whitelist any domain! What's going on?
A: Very likely you've accidentally modified your NoScript Options|Advanced|HTTPS|Behavior|Forbid active web content unless it comes from a secure (HTTPS) connection value. It should never be changed unless you know exactly what you're doing. Just reset it to "Never" (its default value) and everything should be fine again.
That's not the answer in my case. That setting is already set to 'never'.
EDIT: I tried reverting to the previous version NoScript 1.9.9.74 but Allow is still grey.
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Terry, East Grinstead, UK