We have released version 6.3.1 of FlowChart.NET. It contains the following improvements and fixes:

Improved arrowhead rendering
Arrowhead rendering has been improved as shown in following new vs. old version image.
~ arrowheads are rendered as a single path when possible and several arrowhead Shape definitions has been changed to implement mitered joints when HeadPen is set to a thick pen.
~ the point where end segments connect to arrowheads can be specified via the Shape.LinkSegmentInset property. Shape definitions from the Arrowheads class set it to suitable default value. This allows using transparent or semi-transparent brushes without seeing the link line drawn behind arrowheads.
~ arrowhead shadows are no longer filled if the link's EffectiveBrush is null or fully transparent.


Miscellaneous
~ VisioExporter export speed has been improved greatly for large diagrams.
~ For consistence with MindFusion libraries for other platforms, BackBrush in default diagram style has been changed to white brush.
~ Improved DiagramLink rendering speed.
~ Multiple-resize of rotated nodes fixed to apply same offsets in nodes' local coordinate system.
~ Fixed KeepInsideParent constraint for rotated parent nodes.

Registered customers with an active upgrade subscription can download the licensed version from the clients area on our site.
    
A trial version is available for download here: 
https://www.mindfusion.eu/FCNetDemo.zip

Enjoy!