--- Operating System, Graphics card ---
Mac OS X - 10.6.8
AMD Radeon HD 6750M

--- Blender version with error, and version that worked ---
Blender 2.66.6 (2.67 rc1)

--- Short description of error ---
When you control shift click a connector of a node that is disconnected in the compositor it creates a weird node thad does nothing, it calls it a group output, bu so far haven't been able to do anything with it

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Create a new node ctrl shift click any of it's connectors and it wil create the weird output or input group node.