Can't activate scripts in 2.0

Specifically, I need to use the built-in script to flip jpgs in my files horizontally. I can’t get it to work, though. The file is selected, but invoking the script has zero effect. I think there must be something incredibly basic I’m missing, but I can’t figure out what it is. I have also tried selecting the image with the mouse, but no joy so far.

Script is working here. Make sure your document’s “Kind” is a picture type (e.g., “jpg”). The script will not do embedded images, PDFs of images, etc.