Thanks for joining the thread, MaxHeadroom.

Let me assist you with this and provide ways to help you.

To start, may I know if all users were affected by the admin? If so, your company file may have encountered issues. In that case, we can use the tool in the QuickBooks Tool Hub to fix it.

You can follow these steps first to download and install it:

1. Close QB.
2. Download the latest version (1.6.0.5) of QB Tool Hub. Save the file where it can be easily accessed.
3. Open the downloaded file (QuickBooksToolHub.exe).
4. Follow the instructions displayed on the screen to install and agree to the terms and conditions.
5. Once the installation is complete, double-click the icon on your Windows desktop to open it.

To learn how to use the tools, refer to the Step 2 section of this article: Fix common problems and errors with the QuickBooks Desktop Tool Hub.

However, if not all users are affected by it, we can delete and recreate the user. 

Here's how:

1. Go to the Company tab.
2. Select Users.
3. Under the Users tab, select Set Up Users and Roles.
4. Click the user name under the Users list.
5. Then, Delete.

Furthermore, here's an article you can browse for you to be able to add, edit, and troubleshoot QuickBooks Desktop Pro and Premier user login and restrictions: QuickBooks Desktop users and restrictions.

I'll always be around any time you require additional assistance managing tasks in your QuickBooks account. Let me know in this thread so I can further back you up. Stay safe and healthy.