In reply to Anon.

I think you're misunderstanding the post and the Troubleshooting Handbook. It's geared towards those who are providing support on the forums more so than being a guide for general troubleshooting for endusers.

As for cropping photos that don't chop off people's heads, you may be interested in this plugin Sarah Gooding covered a few weeks ago. https://wptavern.com/my-eyes-are-up-here-a-wordpress-plugin-with-automatic-face-detection-for-generating-cropped-thumbnails