@humanetech If you can find someone who knows SVG and is willing to look at the raw SVG created to see what might be causing the problem, that would be useful/helpful. Given that it's created by GraphViz, not sure I can do anything about it, but identifying the problem would be a start.
Perhaps the route to take medium term is to generate HTML5/CSS ... it would be more powerful, but I don't have those skills.
@ColinTheMathmo @humanetech I'm abusing svg features for #Smithereen UI (zero bitmaps so far!), but I'm not sure I know it all that well.