I also experienced issues with Symantec Endpoint and the Agent Procedures. Reapplying the schema resolved the problem, so thank you for posting that.
Issues still outstanding are:
-LiveConnect is not displaying in Firefox 18, but works fine in IE9 on Win7
-Discovery doesn't seem to be working correctly. It shows the device used for scanning under Discovered Devices, opposed to showing any devices without an Agent installed. Perhaps I'm using it incorrectly, but I don't think so.