OPTIMIZER IN 3d STUCK

i ran an Optimize for 3D and mistakenly used a three component MACD selection from several I have. Amibroker correctly rejected this as 2 is the limit.
Now i can not get the system to clear so I can enter a different (2 part) condition.
[ NOTE; I am not trying to do some of the blanking 3 to 2 solutions documented show here in the forum. ]
I just what to revert the system to a clear more for a fresh start
Thanks for your suggestions on this.