This has just started happening - created a swimlane diagram and added a bunch of objects all interconnected just fine. Returned to it later and suddenly any time I tried to drag in a connecting line between two objects it immediately disappears. Only happens over the swimlanes. Swimlane diagram isn’t locked, cell resize auto or manual doesn’t make a difference. It still works to create a separate connecting line from scratch or duplication and drag it into place but obviously this is very slow. Any suggestions?
Edit: Tested in both Chrome and Edge, and with a cloned swimlane diagram, a new one created from a template or as an object from the Diagramming menu, it happens in all cases.