Adding Limb IK and Walk behavior is creating problems

Hi I created my first puppet and rigged it following the Rigging tut at Okay samurai.

After rigging it everything worked as well as Limb IK. 

When I add walk behavior, the character walks, but when I try to drag the arm the arms float away

When I remove walk behavior then the arms work fine...

Not sure what I doing wrong. 

Thank you