Symantec AV, Corp. Edition 10: Primary Server Disabled, Option Greyed Out

Hello, everyone.

I've recently taken over the administration of a network of approximately sixty client computers and two servers. For virus/malware protection, we're running Symantec Antivirus Corporate Edition 10.0.1.1000. When I open the System Center Console applet and unlock the server group into which my primary server and clients fall, I find that the server that is supposed to be working as the primary server is listed as disabled. When I right-click on the name of the server that is supposed to be working as a primary server, the "Make Primary Server" option is greyed out. Furthermore, no clients whatsoever are listed within the server group.

Strangely, the clients still seem to have some connection to the primary server. The event log in Antivirus Corporate Edition still records clients checking in and having virus definition files loaded.

I tried re-installing the Symantec System Center Console. Unfortunately, this had no discernible effect on the problem.  

If anyone has any advice about what might be going on here and/or what might be done to resolve this situation and bring the primary server back online, I'd be extremely grateful for the help. Thanks very much in advance.

Matt