Thanks for replying but what you sent me was not the solution, had nothing to do with the issue.

As I said in my original post, half an hour later the View & Pay Invoice button appeared in my invoice emails in my Inbox. The SAME emails were missing the View & Pay Invoice button half an hour before I posted.

What this tells me is that your generated email code that is sent to my customers is doing a fetch to an Intuit server to put the View & Pay Invoice button in the email. When the fetch fails, the button goes missing. When the fetch succeeds, then the button appears.

This has nothing to do with my QB data file or data file corruption. I did nothing to the data file and the missing button came back in the same emails on their own where it was missing half an hour later. That's an Intuit server problem.

Intuit needs to write better code for the generated emails so that it displays some sort of "Please View/Pay Later" message in the email when your fetch to the Intuit server doesn't work rather than just displaying nothing in the email leaving my customers wondering why they can't pay me.