When someone bought my 2D game, their key file didn't work at all. I checked their key file against my known, working one and there was not one difference. The user was experiencing 14 differences causing it to not run in full edition mode. I even used the key file the one sent me and it ran just fine on my system. Why does it work on my system and not on another? This will cause a big problem when it comes to ordering it. I had to generate another key to fix this.