In version 7.0.2, when I select "Fixed Y-axis scale" in the Graph settings, I get a "Floating point division by zero" error message.
Is there a fix or workaround for this?
Yes. This error has been fixed a couple of weeks ago. Please download the latest build, install it over your current NetWorx, and the problem will be gone.
This fix will be included in version 7.0.3. After that, it will be available for download on NetWorx product page.