We appreciate your response, @FlexFl. Let me step in and share additional steps to fix your invoice email template in QuickBooks Desktop (QBDT).

First, ensure that your company information is showing the correct name. Here's how to check:

1. Go to the Company menu. 
2. Select My Company.
3. Click the pencil icon.
4. Go to the Contact Information tab and ensure the correct company name is displayed. Otherwise, edit it and click OK.

Additionally, it's possible that it's a temporary issue with QBDT. To resolve this, utilize the QuickBooks Tool Hub. It is a launchpad with a collection of tools to assist with various concerns, such as company file issues.

Here's how to install it:

1. Close QBDT.
2. Download the most recent version (1.6.0.3) of the QuickBooks Tool Hub and save the file somewhere you can locate it easily.
3. Open the file (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. Then, double-click on your Windows desktop to open the tool hub.

To learn more, please refer to this link: Fix common problems and errors with the QuickBooks Desktop Tool Hub.

When a customer pays for an open invoice, enter the payment in QBDT. By doing this, the invoice is considered paid and your books are balanced.

Keep in touch if you have other questions about customizing invoice templates. We're always around to answer your concerns. Take care and have a nice day!