I am still having the same issue.  QuickBooks apparently isn’t worried about fixing it.  And if the tech people they have responding had any knowledge of technology, they wouldn’t have suggested the cache of your browser.  Nor would they suggest making a new estimate form.  When clearly it is run through their servers/services to send out emails that are opened by others.  I have edited the actual wording of the email to please ignore if it the button says review and pay or whatever the exact wording is and that it is an error that I’m working with quickbooks on trying to fix, that they will not be paying if they click the button.  But like I said, Quickbooks has not done a thing to fix it as far as I know.  I wish I had something else good to share to fix it.  Because it could potentially cause people to lose business.  Extremely frustrating!