Thank you for the sample code and the screenshot. We found a bug with the Nevron Diagram's PDF export dialog. The issue is now fixed and the fix will be included in the next service pack of Nevron Vision.
We also recommend you take a look at our latest diagramming solution - NOV Diagram. It contains a lot of improvements and new features such as:- better architecture and API
- cross-platform diagramming component which you can use in Windows (WinForms, WPF), Mac (Xamarin.Mac) and Web (Blazor WebAssembly) applications from single code base.
- support for multiple pages in a single drawing document
- ribbon commanding UI
- much better Visio compatibility
- support for formula-based smart shapes (like in Visio)
- many more shapes
- diagram themes, which makes it very easy to change the look of your diagrams
- our development efforts
- and many more