Truly No-Glue-To ShapesThis article also discusses a workaround where the normal "don't glue to me" settings don't work. The situation is this:
You make a shape that uses the Developer > Behavior settings for "not-gluing-to". However, if you Ctrl + Drag a duplicate of a connector, the settings aren't respected, and you still get the connector trying to glue to your shape. It's been this way for a long time, and is still an active "issue" in Visio 2016, as of this writing.