This is the copy/paste canned response I was expecting. Clearing the browser cache/changing browsers does nothing for this issue. It worked fine and now because chances on QBO's backend, it no longer works. So, instead of making money and sending invoices so I can get paid, I have to continue to troubleshoot a QBO invoice issue once again.

Invoicing worked just fine until the last six months or so and has been nothing short of a dumpster fire since.