EMT29

After years of easy and trouble-free link additions, I just experienced this problem for the first time. It turned out that for some unknown reason, I had neglected to first highlight the the text that I wanted to use for display. As soon as I did that, the link button became selectable. When your fingers are used to doing work on autopilot, it's remarkably difficult to figure out what they didn't do when they didn't do it.