Disappearing Spaces in Lion

I just realized that if you have your Dock on the left edge of the screen you cannot create a Space in Mission Control, the option disappears. Move it to the botton or right and you will be fine.

Weird.

May 2, 2012: update, the Space tab appears on the opposite side from the dock, so don’t go looking for it on the left side if your dock is on the left.