Pretty sure it's not a "cheat code". Are you sure you aren't trying to make an illegal move?
An illegal move was my first thought too.
I agree, probably tried to make an illegal move and didn't realize it.
Methinks an illegal move did he make,
But complained he did, for complaint's sake.
Now my leave from you I will take,
Since the OP appears to be a flake.
Yes, I'd really like to see the game in question and the exact position and piece he was trying to move. A pinned piece or trying to make some other illegal move was the first thing that went through my mind when I read the original post, too.
My bet is he will never post a link to any game at all because his piece was just pinned and he missed it.
[Mod] No discussion of cheating in the main forums.