Link to the mentioned LayeredLayout bug with simple reproduction code:
http://mindfusion.eu/Forum/YaBB.pl?board=fcnet_brep;action=display;num=128516190...

It works, thanks!
Another related question - is there a way to set minimal distance between nodes in subgraphs aftrer using layeredLayout MultipleGraphsPlacement = MultipleGraphsPlacement.Vertical, even thought layer and node distance is set to 30, the distances between nodes from different groups are about 5 px somewhere...

Also maybe a bug - adding new link into diagram does not work as expected (sometimes?) The node.outgoinglinks an incoming links does not contain all links related to the node. I created simple method which is called after all link creation and it fixes almost all problems

     public static void FixLink(DiagramLink link)
        {
            if (!link.Origin.OutgoingLinks.Contains(link)) link.Origin.OutgoingLinks.Add(link);
            if (!link.Destination.IncomingLinks.Contains(link)) link.Destination.IncomingLinks.Add(link);
        } 

I guess adding link to these collection should be automatic feature of the diagram... well, it is not.

And another small problem - when using LinearGradientBrush for table node caption background, its positioned for the whole node, not just for the caption - if the node is long. the gradient is almost invisible. If there are no cells, the gradient is perfect.

This version fills only the caption bar with CaptionBackBrush:
https://mindfusion.eu/_beta/diaglite_captionback.zip

Now you might also need to set the table's Brush, it is semi-transparent by default.

I hope that helps,
Stoyan