Unknown problem with rig jumping around

Can anyone tell me what is wrong with the selected rig? It jumps location depending on whether it is in pose mode or not.
Thanks for looking.
https://dl.dropboxusercontent.com/u/13211994/GameEyeStalk.1.2.SimpleLid.blend

Edit: Also, although the rig is selectable, there is no outline on it, which is a little confusing. Is there some toggle for this?