A checkbox I can't uncheck is a surprise. [snip]
But there is a difference whether the checkbox is enabled or not. A disabled checkbox is inactive, so it is perfectly normal that it can't be unchecked. However, the same is not true if that checkbox is enabled. Once it is enabled, one should be able to toggle its state.
Absolutely - this is a simple matter of having a choice which only applies if other conditions are in a particular state. The alternative would be to hide the checkbox completely unless the state called for it, but this isn't quite as 'open' an approach to UI design - and isn't necessarily as kind and helpful to the user.
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