I believe I had the same problem. It might have something to do with the - before MC_FIXED_HEIGHT. Try doing (MC_FIXED_HEIGHT * -1) to turn it in to a negative, or #define it like you did with MC_GROUND_HEIGHT.
Re: Mouse Aiming on 1 Z Coordinate
[Re: Valdsator]
#383575 09/21/1123:1309/21/1123:13