Macro With Found Image Now Fails

This macro worked fine for a while, but today I'm getting a message that there's no unique image found.

Can you save me some debugging by pointing me in the right direction for figuring out what's wrong?



I thought I'd found the problem, but I was wrong. The problem was more subtle:

Because Mac context menus are somewhat transparent, the menu color was different depending on which part of my desktop wallpaper it was over. I fixed that with Sys Prefs/Accessability/Display/Reduce Transparency