UPDATE: 

3 hours of QB Phone support;

Reinstalled QB - Didn't work.

Reinstalled QB, Made sure it was completely updated, also made sure Windows10 was completely updated - Didn't work.

QB Tool hub repair App, ran everything known to man in the App - Didn't work.

Tried rebuild of company file - Didn't work.

CLOSED the call with QB support saying that I'd have to wait for Microsoft to fix the problem and keep checking for MS updates. THAT was 3 weeks ago. Still no resolution after checking for both QB and MS updates EVERY DAY !!! 

Seems like emailing an Invoice is one of the more VALUABLE functions of QB. 

I would think that fixing this problem would be at the TOP of the list.

I'm not sure if QB Support has me on the list of people to send updates of the fix status, but I'd sure like to know how I can be informed of any Fixes for this issue.