What I can think off of the top of my head would be, that perhaps the actor is locked?

To verify this, you'd chose the thigh and go to Object -> Lock Actor and see if it's perhaps checked.

 

Another thing could that the Settings for this actor are wrong.

Select the thigh and click on the triangle/arrow thingy to the right of the dials value digit. A little context menu should appear, where you chose "Settings" from. You then get to see a few Parameter settings. Maybe the min/max limits as well as the Sensitivity are in need to be taken care of.

 

If it's something differently than that, well .. I can't help more, lol.