Thanks so much. The code you posted and some minor tweaks have solved most of the issues I've been having.

For some reason, having tracked changes on makes the above code behave oddly in some situations (e.g., one function changes "1+1" to "1 + 1" with tracked changes off, but with tracked changes on the output is "11+ ").

However, I can work around that by running the macro with tracked changes off then comparing documents to add the tracking.

The only thing I still can't automate is to remove the percentage sign in text such as "20%-40% when an en dash is used instead of a hyphen. However, I have about 150 functions in the macro so having only one misbehaving isn't bad.

Yes, that's a known 'Track Changes' behaviour. You could have the macro toggle & restore the 'Track Changes' state.
That's easily resolved by changing
.Text = "([0-9])%(-[0-9])"
to:
.Text = "([0-9])%(?[0-9])"

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]