When Left arrow and Up arrow are pushed together, my ship will not shoot.

Hey guys, wondering if some of you have got into this problem. When I hold down my left arrow and my up arrow at the same time. My ship will not shoot. If I hold any other combination ex. left and down, down and right, right and up. It will shoot just fine. Any idea’s on what would cause this?

Thanks.

That’s a limitation of the keyboard hardware - take a look at this question.