o.o? Not too sure what would be wrong with the gamble command. I would try deleting the gamble commands, then re-importing them.
As for bankheist, did you disable and re-enable the mini-game after changing the settings? You have to do this for new settings to kick in. The command is !bankheist x (x=points to risk). In your case, !newqueen x. Example !newqueen 100