"making the bones fatter" using ctrl alt s doesn't seem to change anything about them at all

Hi,

as title suggests when I try to scale them to make them easier to see, they don't change at all, if I try scaling them on individual axis during it they begin to rotate... is my pivot point, or object centre perhaps which is the issue?

http://pasteall.org/blend/index.php?id=52968 my file is here if this helps! Hope you cna help, I'm wondering if I done something wrong setting it up.