I've been having some issues with the pin behaviour when combined with physics objects.
I want to simply unpin an object then apply an impulse. You can find a .capx here: https://www.dropbox.com/s/ub8squybwbtwvsl/missile%20pin%20test.capx
99% of the time the force isn't applied. When adding a wait, of around 0.1 seconds it launches, though becomes unpredictable across different spec devices.
I've even tried testing for the object not being pinned then applying the force but it makes no difference :(
Any help would be greatly appreciated.