By Adam Nagy
When you create new constraints in a Sketch then the constraints' symbol will show in the UI. In previous releases it did not do that.
Also, it only seems to happen if nothing depends on the Sketch geometry (e.g. no Extrude) so that the document does not get updated automatically.
In Inventor 2015 a new application setting was introduced that could be responsible for this:
Application Options >> Sketch >> 2D Sketch >> Constraint Settings >>
Settings... >> General >> Display constraints on creation
The constraint icons only show until you update the document. So once you call Document.Update they will disappear.
Sub AddConstraint() Dim doc As PartDocument Set doc = ThisApplication.ActiveDocument ' The Skecth needs to be selected in the UI Dim sk As PlanarSketch Set sk = doc.SelectSet(1) sk.Edit Dim pc As ParallelConstraint Set pc = sk.GeometricConstraints.AddParallel( _ sk.SketchLines(1), _ sk.SketchLines(3)) sk.ExitEdit ' This makes the constraint icons disappear doc.Update End Sub