Strange problem with Extrude in Maya 2009

I had a strange problem using Extrude in Maya 2009 while following the "Lynda.com Autodesk Maya 2009 Essential Training" movie "0306 Using the Extrude tool". Inside of allowing me to move the gizmo handle in order to move the extrude face, it just get "stuck", and only allow me to rotate amount the surface. Maybe it was some setting that I made before, but I tried and tried and couldn't get it working. Finally I had to close the application and start it again. That seem to solve the problem.