I was trying to reproduce this issue, but I am unable to embed YouTube videos at all. I get Error 153: Video player configuration error. I have tried my own videos to verify that embedding is enabled, but I cannot find any video that works. Pasting a link does reformat automatically, so "https://www.youtube.com/watch?v=9kW7LknzOlk" becomes "https://www.youtube.com/embed/9kW7LknzOlk?autoplay=1" when you paste it into the Web Page input box, but it will not load.
I did test it by putting that URL into an iframe on my computer's web server to make sure it is not my computer before I posted.
