Missing 'Generate' button in Rigify Buttons tab I cannot find the Generate button to generate my rig, in the Blender Cookie Rigging Tutorial it should be found in the bottom right corner as another tab under the "Rigify Buttons" tab.

However I cannot see the Generate button under the Rigify Buttons tab. I can only see an add sample button.



You can see the Generate button in the bottom right corner of the screen clipping from the Youtube tutorial, but not on my screen.
The Generate Button is only available in Object Mode. The screenshot you posted shows that you're in Edit Mode Press Tab then the button should appear.