Word 2011 - Tables Layout button disappeared!

Hi.

Normally when I click on the "Tables" a button in the Ribbon it extends horizontally and allows a new " Tables Layout" button to its right side. This is now not appearing at all. I am highlighting a Word Table nothing nada. Just that up/down "to hide or not hide" motion is going on with the Ribbon panel below.

Why is this happening and how can I can get the "Tables Layout" button back again? Please reply soon. Thank you.