Thank you for providing a visual reference, @Pro Grade Enterprises Inc. You may consider checking your user access rights.

If you're the primary admin, you should be able to reactivate a customer. You can inquire your primary admin to review your permission and change it.

However, if you have full access rights, I suggest re-sorting your customer list to fix this unexpected behavior. In addition, if this client is a sub-customer, ensure activating the primary client first so you can reactivate the customer/job. Or you can switch the sub-customer under another active primary customer name to reactivate it.

Also, I can see that you're in Flat View mode. Make sure switching to Hierarchical View to determine if it's a sub-customer or primary client. To change it, right-click on any name and then choose Hierarchical View.

Let me show you how to re-sort your client list and reactivate a sub-client or primary client:

1. Go to the Customers menu and then select Customer Center.
2. From the Customers & Jobs tab, right-click on any client/job and choose Re-sort List.
   
3. Click OK.
4. Once done, filter the Customers & Jobs tab to All Customers.
5. From the client list, double-click the client name in question.
6. See if you have the Customer drop-down field from the Address Info section.
   
   
7. If you have, change it by clicking Add New to reactivate it.
8. Hit OK.

To reactivate a primary client, click the X mark beside its name. Then click Yes to proceed.

If it persists, I suggest following Fiat Lux - ASIA's suggestion to reinstall the program. Before that, I suggest backing up your company file data so you can restore them after installing QBDT.

To help you manage your customers and jobs, you can refer to these articles:

• Tracking job costs in QuickBooks Desktop
• Customize customer, job, and sales reports in QuickBooks Desktop

Please let me know if you have other concerns about managing client's list. I'm always here to help, Kim. Take care.