Why are you using Forms Protection? You don't need that with content controls. That's what is unnecessarily forcing another checkbox to be selected. If you use read-only editing restrictions and mark the content controls as exceptions, you won't have to select another checkbox - you'll be able to click anywhere outside the checkbox.

As for re-selecting the check box, how then is the user to ever select a different one?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]