The preview when I send invoices is blank.

Hello, @josephmccubbing. 

To make sure that’ll you’ll able to preview your invoices before sending them, make sure to have your Adobe reader or PDF viewer updated to the latest release version. Then, set it up as the default application to open PDF documents. 

Here’s how to have the updated version:

1. Open your Adobe Reader on a separate window and click Help.
2. Select Adobe Reader.
3. Go to the Adobe Reader Downloads page. The web page automatically detects your OS and Reader version.
4. Choose Install Now.
5. Open the downloaded file and follow the rest of the on-screen instruction to finish the updating process.

Once done, set it up as a default application to open PDF documents:

1. Go to your PC’s Start menu and find your Settings.
2. Choose System and then Default apps.
3. Click Choose default apps by file type.
4. Scroll to find .pdf.
5. Click Choose as default and choose Adobe Reader or Adobe Acrobat.

For additional insights, you may check out this article: How to update, repair, or re-install Adobe Reader/Acrobat. 

Let me know if there's anything that I can help with your invoices. I'm always here to assist. Keep safe and have a great rest of the day!