Hi Brian, so re: JacobianFunctionGraph - it kind of looks like the entire PopulateFonts is maybe pasted in from a different command and shouldn't be in there at all? It seems to be referring to controls that are not in the .htm file. It looks like you can just remove it and remove the 2 calls to it in the .js file and then JacobianFunctionGraph appears to be working.

I guess probably in v3 the exception generated in the .htm code is silently eaten, as if there was a try/catch around the whole function.

- Michael