Well, I know that the agent was certified as being backwards compatible. Maybe you're just not using features that require the agent to be upgraded so it doesn't bother. I don't quite know exactly when it decides that an upgrade to the agent is necessary. You're right that all of the documentation says it does it automatically. Note that it only does so on Windows. Unix upgrades must be done by hand, at least according to the documentation. I've never seen it or tried to do it though. Your next step might be to check with support.