Hi there, @Finless.

Let's get the bills to show in the Pay Bills window so you can get back to working order.

It's possible that your software isn't updated. Let's reset the update release to get this fixed. Here's how:

1. In your QuickBooks Desktop, go to the Help menu and select Update QuickBooks Desktop.
2. Click the Update Now tab, then put a checkmark in the Reset Update checkbox to clear all previous update downloads.
3. Select Get Updates to start the download.
4. When the download finishes, restart QuickBooks.

I'm adding this article for more details: Update QuickBooks Desktop to the latest release.

However, if you get the same result, I suggest opening the bill and process the payment from there.

1. Go to the Vendors menu, then select Vendor Center.
2. Select the vendor from the list and open the bill transaction.
3. In the Enter Bills window, click the Pay Bill option.
4. Click Pay Selected Bills in the Pay Bills window.

Keep in touch if you need any more assistance with this, or there's something else I can do for you. I've got your back. Have a good day.