Hi there, @ufnetvet.

I admire you for trying all the basic steps to fix the crashing issue you're experiencing. 

There was a similar issue about QuickBooks Desktop crashes or stop working when emailing or printing transactions. It has been resolved last June 2022, and at that time, they found out that Microsoft had released a new update for Windows 10 versions 1903, 1909, and 2004. 

This can be resolved by downloading these new updates in the Updates & Security under Settings in Windows.

Should the issue persists after following the steps, I'd recommend contacting our Technical Support team. They can take a closer look at the cause and may submit another case to investigate whenever necessary. 

Here's how:

1. Go to the Help menu. 
2. Click the QuickBooks Desktop Help. 
3. Press the Contact Us hyperlink. 
4. Give a brief description of the problem and hit Continue. 
5. Scroll down and select Get a callback. 

Here's an article to help you customize email templates and use them to send messages from QuickBooks in the future.

Let me know if you have additional concerns about emailing your invoice. I'll be here to guide you again.