We have released version 6.5 of FlowChart.NET. It contains several customer-requested features and improvements:

Non-blocking layout methods
All graph layout classes now contain an async ArrangeAsync method that runs layout calculations in a background task. This is only available in .NET 4.5 build of the diagram assemblies.
Code:

async void OnLayoutLayered(object sender, EventArgs e)
{
    var layout = new LayeredLayout();
    await layout.ArrangeAsync(diagram);
    diagramView.ZoomToFit();
} 

Miscellaneous

• ImagePadding property of ShapeNode, TableNode and Cell lets you set padding space between element's borders and the contained Image.
• LinkPadding property added to LayeredLayout specifies how much space to leave between links when LinkType is set to Cascading.
• ContainerNodes now apply the TextPadding value.
• Merge indicators for cascading links now supported as counter-parts of branch indicators from the 6.4.3 release. Set the LinkMergeIndicator property to specify the indicator shapes and MergeIndicatorColor and MergeIndicatorSize properties to customize their appearance.
• Custom element added to BranchIndicator enumeration. If it's assigned to LinkBranchIndicator or LinkMergeIndicator, the control raises DrawBranchIndicator event to let you draw custom indicator graphics.
• Export overloads that write to Stream objects added to PdfExporter, VisioExporter and Visio2013Exporter.
• PageAdding validation event added too TabbedDiagramView control.
• Public Item property of TreeViewConnectionPoint provides access to target TreeViewItem of links.
• Vertical scrollbar is displayed on the left side of DiagramView when RightToLeft is enabled.

Installer for the latest version can be downloaded here, or from the clients area on our site:
http://www.mindfusion.eu/FCNetDemo.zip

Updated assemblies are also available as MindFusion.Diagramming NuGet package.

Enjoy!