I am using a Thermaltake Challenger Prime keyboard. When I am playing games if I hold CTRL down and try to move with specific arrow keys it wont work. Pressing BACK and LEFT arrow keys or BACK and RIGHT, it will only do one or the other. Pressing FORWARD and LEFT or RIGHT works fine. I saw on the forums someone else had trouble similar and you suggested trying another computer so I took it over to my parent's place and tried it on their machine and has same trouble.