I have been using the CVF debugger for a long time now. I am now using version 6.6A. As in this version and previous versions, i can't seem to force it to do what i want. I am getting a NaN in some of my variables. well, to trace it back is very difficult. if the debugger would simply raise an error when this condition arises, that would solve my problem. Ie, as soon as there is a divide by 0 or other situation to cause a NaN to occur, i want to see it. Is there a debug option to set? I have looked and looked, but have not found anything to trigger a break when there is a NaN.