just futz around with it, if you make to many changes it wont like it and go invisible.
when i tried adding poles it was going invisible, and when i added knees it sometimes went invisible, and when i took him a off axis too much the same thing happened.
just mess around with it, you have to realize quaz didnt design this so that it was the easiest thing to do, custom grabs were not his concern, so there may be little obstacles like this that you have to get around