Platform behavior confusion

Why will the cube not jump?

dropbox.com/sh/7af8eovvvzmr1yp/wbF6Qk5NAD/confused.capx

I built a platformer yesterday,

dropbox.com/sh/7af8eovvvzmr1yp/Dot7b86BNP/platformer.capx

and now for some reason I can't figure out why this dumb little cube wont jump?? -_-

Any help guys? I'm sure it's painfully obvious.

Thanks

I checked your capx. Basically your cube is falling indefinitely. Try creating a temporary sprite as floor, and give the sprite the Solid behaviour, then you can jump once the sprite touches the floor.

Ah of course, thank you!