Hello there, @ProPlaygrounds. I appreciate you trying some steps to get this fixed. 

Let's perform some troubleshooting steps to fix this unexpected behavior. To get started run the File Doctor tool. This helps fix company file issues, so you can see the existing customers on the list.

To start, let's download and install QuickBooks Tool Hub. 

1. Close QuickBooks.
2. Click QuickBooks Tool Hub. 
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When the install finishes, double-click the icon on your Windows desktop to open the tool hub.

Then, we can now run QuickBooks File Doctor.

1. From the tool hub, select Company File Issues.
2. Select Run QuickBooks File Doctor. It can take up to one minute for the file doctor to open. 
3. In QuickBooks File Doctor, select your company file from the drop-down menu.
4. If you don’t see your file, select Browse and search to find your file.
5. Select Check your file (middle option only) and then Continue.
6. Enter your QuickBooks admin password and then select Next.

For further guidance, please see this article: Fix Company File and Network Issues with QuickBooks File Doctor. Also, try repairing your QuickBooks Desktop. Repairing an existing QuickBooks installation helps resolve program-related issues or errors.

If the issue persists, you may reconnect with our Support Team. This way, a live representative can check the previous case you had and investigate this message further.

In case you wanted to filter or add columns to job costing reports, this is a great article that you can reference: Customize customer, job, and sales reports in QuickBooks Desktop.

Reach out to me in the comment section if you have any other issues or concerns. I want to make sure everything is taken care of for you. Have a great day!