Glyphs quits and will not reopen

Where is the crashes tutorial? I have attempted to remove every Glyphs file I could find from the /Library, but a couple of problems remain: 1. When I double-click a Glyphs document, Glyphs will begin to launch and then quits. 2. Dragging a Glyphs document to the icon on the Dock will provoke Glyphs into launching, but them quits.
I can, however, open Glyphs documents by going to File…Open… .

The link to the Crashes tutorial was listed earlier in this thread: