The unofficial (5.3.5) version was beginning to have lots of playback issues so I forked the newest version (5.3.10) and restored viewsettings for reFocus.
Instructions
1. Delete your existing youtube-plugin.
2. Install from zip within Kodi.
You might get an error running the plugin for the first time!
Tested with reFocus on Jarvis (Linux) and reFocus on Krypton (OSX)