This is a weird problem I came across, and though I have heard of it before, I didn't really feel it till today. In my game, I need four movement keys along with 3 other buttons for stuff like jumping and others, so I mapped the movements to the "arrow keys (Code : 37-40)" and jumping to space(32). But it seems if I press left+up+space, space won't register. At first I thought my code was wrong, but after spending a few hours on the net, I found some keyboards(and a major percentage at that) won't register certain key combinations.

So how do I deal with this situation which is outside of flash? Is there any default key config I can use and be sure it won't cause similar problems on another keyboard?