Colleague rolls up sleeves to start adding/deleting comments with Track changes.

Colleague selects block of text to apply local formatting.

Colleague asks me "why is Word displaying a message about 'must be a number between …'? I'm not trying to enter any numeric values."

I pass the question on to you …

[there may be answers in the forum already, but the search option discards most of the term "must be a number between"]