Hello, @PAT0511. 

I can only imagine what you've been through when trying to open another company in QuickBooks Desktop, and this is not what we want to happen.

I understand you've contacted our customer support team to sort this out. Still, I recommend contacting them again and having a screen-sharing session so they can investigate your concern further. 

Here's how: 

1. Go to Help, then select QuickBooks Desktop Help/Contact Us.
2. Click Contact Us.
3. Give a brief description of your issue, then select Continue.
4. Choose a way to connect.

If you're using QuickBooks Accountant and QBDT Enterprise, you'll want to open two company files simultaneously for future tasks. You can check out this article for a detailed process: Open and use a secondary company file in QuickBooks Desktop.

Let's hear if you have more queries about managing your companies in QBDT. I'm always here to help.