Defaults to single user at login

I'm here to resolve it, @WBCINC.

The most possible reason why it keeps on switching to single-user mode is because of the network setup. We can download and run the QuickBooks File Doctor. This will fix company files and network issues in QuickBooks Desktop. Here's how:

1. Close QuickBooks.
2. Download the most recent version (1.6.0.3) of the QuickBooks Tool Hub. Save the file somewhere you can easily find it (like your Downloads folder or your Windows desktop). Note: If you've installed Tool Hub before, you can find out which version you have. Select the Home tab. The version will be on the bottom.
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When the installation finishes, double-click the icon on your Windows desktop to open the tool hub.

For the detailed steps, please check this article: QuickBooks File Doctor.

Aside from that, ensure that your Database Server Manager is set up properly. This is the tool that allows users to access the company data. Please check this article about QuickBooks Database Server Manager, and let's perform all the steps provided.

I'll always be here if you have other questions. Just leave a comment below.