After embedding YouTube video to article node body with WYSIWYG the video works fine.
However when trying to edit the same node again the following error appears:

Exception: Error Processing Request. (Error: -101, Network is unreachable) in MediaYouTubeStreamWrapper->getOriginalThumbnailPath() (line 31 ........../modules/contrib/media_youtube/includes/MediaYouTubeStreamWrapper.inc).

When switching of the "YouTube Preview Image" in Structure/Filetypes/Video.... the node can be edited again!

Video runs fine on the site, just editing the node generate above error.

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peerv created an issue.