Why NLA editor run only the top action strip I get an error when I try to create a walk cycle using two action strip. The first is walk cycle in place and the second moving cycle from point A to point b. I could not understand why the NLA run only the top action ? 
When I put the walk cycle as the top, the person walks in place and when I put the moving cycle at the top the person moves from A to B without any motion walking!!!
You keyframed all bones in the movement action:



When you delete everything but the first (master) then it would work as expected.

The reason why couldn't see this is the checked show_only_errors option:





.blend