I believe I found a bug with nested draggable.
If you look at this fiddle http://jsfiddle.net/9Z92w/3/, it's working fine.
But when you add throwProps into the mix, you get an error the second time you try to drag, "TypeError: ce.tween.isActive is not a function".
Check out this fiddle.
http://jsfiddle.net/9Z92w/4/
PS: in the second example, I'm using the upcoming GSAP 1.11.0 release