Thanks so much for your reply! never imagined the creator of the rig would read this 😄
Even now I understand the controls, I think it might be a more serious issue? I've made a little video for you to check out. When you switch between IK and FK, that control deforms the rig in a weird way. and scaling /rotating it doesn't make the limb bend. you can see its having some very minor effect but thats it. This is a fresh rig ive setup just to test this, i havent touched any skinning, its all default. I wasnt able to find the tutorial videos you were talking about, could you provide a link?
Thanks for your help.