Player can't jump while running

I am making a platformer by following Jerementor guides. Below link is the part I am currently doing. However, when my character is facing right and I press space + right arrow key + up arrow key, my character can dash and jump. But while I am facing left and do the same thing, my character can't jump while dashing to left.

youtube.com/watch ... t=0.844537

Here's my capx file:

dropbox.com/s/ffet9ecdmdhdtre/Youtube%20game.capx

Any help??

Is a known bug:

Use another key instead of space, then it should work.