When loading https://www.youtube.com/new I just get a blank page (more or less). Loading with QupZilla is ok (QtWebkit).
Not again.... Works for me. What version of WebKitGTK+?
Also, what errors do you see in the web inspector?
My fault, Eolie was settings a global user agent (Chrome one) but this is not a good idea. It's really sad that in 2017 we always need to add hacks around UA :-(
Yup. :( I guess you found bug #171603.