Thanks for joining this thread, Login. I appreciate your detailed information.

There's a few known reasons why multi-user mode may be encountering issues:
 

• QuickBooks isn't installed on the server.
• Windows file permissions aren't set properly.
• Hosting settings being configured incorrectly.
• The database server is unable to open your company file.
• Firewall or antivirus software isn't allowing communication between user computers.

There are a few troubleshooting processes you can perform to try to get it working properly. Initially, I'd recommend checking your folder permissions on the server computer. You'll want to confirm that your folder holding the company file has permission to be on your network.

Next, make sure that the QuickBooks Database Server Manager is installed on your computer. This enables company files to be shared with other computers over the network.

After verifying your QuickBooks Database Server Manager is setup properly, you'll want to check the Windows admin rights and assure your firewall settings and folder permissions are configured properly. Once you're finished, you can scan the folder to access your file over the network.

If QuickBooks still crashes when trying to access multi-user mode, I'd also recommend confirming that you've turned on hosting on your server computer.

Here's how:
 

1. In the top menu bar, go to File, then Utilities.
2. Choose Host Multi-User Access.
3. Select Yes.

In the event your books continue crashing while trying to use multi-user mode, you'll want to continue getting in touch with our Customer Care team. They'll be able to pull up the account in a secure environment and conduct further research with you. They also have the ability to do screen-shares to see what you're seeing on your computer.

They can be reached while using QuickBooks.

Here's how:
 

1. In your top menu bar, go to Help, then QuickBooks Desktop Help.
   
   
    
2. Click Contact Us.
   
   
    
3. Enter a brief description of the issue in our Ask a question (or tell us what's wrong) field, then hit Continue.
   
   
    
4. Select We’ll contact you for a callback or Message Us to start an instant messaging session.

Be sure to review their support hours so you'll know when agents are available.

I've also included a detailed resource about QuickBooks crashing which may come in handy moving forward: While working in QuickBooks, QuickBooks closes unexpectedly (crashes with or without an error)

I'll be here to help if there's any questions. Have a lovely Thursday!