Since you have two checkboxes referring to the same bookmark, you can't really expect anything else; whichever one you check/uncheck last will take precedence. You should ask yourself why you have two checkboxes acting on the same bookmark and whether that's really necessary. If it really is necessary, then you're going to have to work out the logic for each/either checkbox to check the other's state before changing the bookmark state.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]