I have used the same feature, with both the shortcode and html in other themes with no problems, only enfold (so far) gives an error?
had same problem – put into learning mode, worked.
it was 440×248 to match the images, but was not big enough for the responsive break. so the video was set to 630×354 for the tablet viewport. having the dimensions in a code block or text block does not scale well. using the youtube link does, but there is no control over the settings (as mentioned above)
i have the same problem, so i went to a hosted video, but there is no pre-load image in the player, only a black screen. Can this be changed?
Also – i would prefer to use the YouTube player / embed code, if you have fixed the responsive issue.
Thanks
Mike