Which keyboard layout are you using?

Are you running any key remapping software?

Just an idea: Games handle keys in different ways. If you're using us this won't make a difference, but otherwise the differences between engines might give away some useful hint.

If I remember correctly:

• Source based games (e.g. Half-Life) seem to read raw keycodes and display the keys as on the us-layout.
• Unreal based games usually try to display them as in the layout.
• Unity based: as Unreal, except for the keys where 1-0 are on most layouts, which are always interpreted as 1-0. (try programmer-dvorak or french layout to see the difference)