AHH! Found bug! In the cap, double clicking the 10 event (set velocity) makes colour settings popup.
I know, I've been having a problem with that too, I just haven't gotten around to reporting it yet. I should be more on the ball
Whenever that happens, I've been having to just delete the action and write it again from scratch. Alternately, you should be able to "soft click" the numbers themselves to change them right on the event line without having to open the edit action window.
Doh! Beaten by Ashley.
Also I think this is a bug : why there's a delay when the detector should be in the player position? I mean, jump, and the detector will work like an elastic.
The delay is there because the physics engine is updating before running the events, so there's a bit of a lag. Since it's just detecting when you're on the ground, it shouldn't be too much of a problem. If you were using it to, say, detect if you're stomping on an enemy's head, there would definitely be a problem.