Hello EMC Lately i have been aware of an issue with the player list. As you can see Agent_Notch is online on /p Agent_Notch, but somehow invisble on the player list also know as TAB
When you disguise as a mob, you actually /vanish and the server shows a different entity in your place. That's why you don't show up in [TAB]. Interestingly, because admins (and moderators too, I think) can see /vanished people, they see both the player and disguise. Triippppyyyyyy...