SettingsPane's StrokeDashArray Combo in the Style tab is not updated correctly after save and load of diagram. 

Use a diagram, use the settings pane to set non-default value of the shape's strokedasharray.

Save the diagram. Open new solution. Load the saved diagram.

Open the settings pane on the shape you have edited before. Notice the ComboBox is not updated with the actual strokedasharray of the selected shape.