Hi, sorry to sort of hi-jack the thread, but having a similar issue with the platform behaviour.
I have a sprite set with the behaviours "scroll to" and "platform" with the default controls enabled. I have other sprites with the behaviour "solid".
When I play/preview the game I am not able to jump using the up key (I assumed that was the default). So I changed the default controls option to no and i made a custom event to simulate jump etc, and now I can jump, but only the first time. Any ideas on whats wrong?