Did you save a prior version of the spreadsheet that you can go back and reference? Formula evaluator is good (when the formulas work). Maybe you can find the issue comparing the old model (that still works) and the latest one that has the error.

Regardless, somewhere Bill Gates is laughing...... rolleyes

Jesus... I hope you know Him personally like I do.

Si vis pacem, para bellum.

Proud crossbow hunter!