Hallo I'm quite often running in a pretty anoying display issue with VW 2017 when I group 3D objects or create a Symbol, the geometry sometimes becomes inviesible. Snaping and markers still appear. This  happens in wireframe and within groups or Symbols.   The effect is worse, because it happens more often, within Symbols. SInce updating to SP1 I have the impression that this happens more often. It is almost impossible to edit 3D parts of Symbols. :-(