Hi Brian, also probably what is messing up your actual script is if you have characters like just a plain - or . as the text content in a NumericInput field, when you try to retrieve the .value property of that control you'll get the JavaScript 'undefined' value as the result rather than an actual number.

So another way to guard against this problem is to look if any of those fields have an 'undefined' value and bail out from further processing if that's the case.

That would be something like this:

			function UpdateElastica()
			{
				if ( P.value === undefined || U.value === undefined || WD.value === undefined )
					return;

I think with this added in as the first line of the update function it should avoid your problem.

Before maybe your script is getting stuck in an infinite loop or something because it's expecting those values to be numbers but they're actually 'undefined'.

Please let me know if you still see any problems after adding this in.

- Michael