Thanks for following up on this thread, chinckley.

I appreciate you trying the troubleshooting steps mentioned above. Since the invoice is still showing as overdue, I recommend reaching out to the Desktop Support Team. Agents have specialized tools, such as the ability to share screens, and take a more in depth look at the issue. Additionally, if the problem needs to be further escalated they'll be able to take care of that for you as well. 

Here's how to get in touch with the team:

1. With QuickBooks open, press the F1 key on your keyboard.
2. Select Contact Us.
3. Enter Support in the field and click Continue.
4. From here you can begin a live chat session with an agent.

The following linked article provides these steps if you ever need them again in the future: Contact the QuickBooks Desktop Customer Support Team

Please feel free to reach back out here if you have any other questions. Take care!