Could you attach a saved diagram file showing the problem?

Are there several self-loop links connected to the start-state node? The additional links should be drawn as larger concentric rectangles around the innermost self-loop, so I guess that's a bug.

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Are you using any of the built-in SaveTo* methods to save the diagram, and reloading it when the form opens again?

Are you applying OrthogonalRouter again after rebuilding the diagram from view-model, or saving and reloading control-point coordinates of links?

Could you call SaveToXml right after rebuilding the diagram from view-model but before calling OrthogonalRouter, and attach the file here?

This file contains only two links and they aren't self-loops. If you are creating self-loops at a later point, please attach save-file created after it.

Maybe also verify that when rebuilding from the model you are actually connecting both ends of all links to a node. E.g. you might have some validation code that checks if nodes are already connected and prevents new connections, leaving newly created links unconnected? OrtogonalRouter ignores unconnected links in my test.

diagramProbe_001.txt is still the same file as diagramProbe.txt I've tried to reproduce that by drawing the same diagram from picture, but it still seems to work correctly. I'm only calling the Arrange method as below, are you setting any properties of the router class?

new OrthogonalRouter().Arrange(diagram);