Hi, JL-
Thanks for your response: here are answers to your questions:
~Do you know if the _Change event is occuring?
Yes, the change event is triggering- the code generates an error
message each time. The intent of my post was to determine if I was
using incorrect syntax, and what is the correct syntax in this context.

~they're going to see that prompt quite a bit as long as the value
remains False
That's the idea: to remind the user they need to validate/accept
certain data before making changes and before moving on in the process.

~they'll never see the question again - the .value will change to true
and remain that way
A good catch, and an important one. What I did not mention in the post
is that there is an "on close" event that changes the value to false;
that value is saved with the file and "reset" for the next user.