Fixing the dreaded Omnigraffle “move, undo, line disconnection” madness

This has happened to me many times in Omnigraffle.  It doesn’t always happen, so I’m not exactly sure what the cause is. Scenario:  I have a big diagram (e.g. a sitemap or a flowchart), and I select a bunch of boxes and move them. All is well; the boxes move with the lines. But then […]