Update 11th August 2017
**If you are having issues with youtube on kodi not showing your subscriptions or videos & loading blank pages, I recommend you download the new YouTube plugin respository from here. Install the repository on Kodi and update the youtube plugin to the latest version, currently YouTube for Kodi 5.4.2. **
Recently Bromix, the developer of the awesome YouTube addon for Kodi decided to quit the project & concentrate on other things. This quickly lead to the addon breaking, days after he announced he was leaving the project. As yet nobody has taken up the reigns on this plugin. Over the past few days the plugin has been broken, with the My Subscriptions tab breaking and thumbnails failing to load. If you use this addon like me you will rely heavily on the My Subscriptions tab. I subscribe to a lot of YouTube channels & tend to watch this in the evening with my wife over watching traditional TV. The My Subscriptions tab essentially brings together all of the latest videos (in order) from every youtuber you subscribe to.
It would appear that since Bromix has left, there are issues with api keys. The initial fix was to generate your own keys and hack together the plugin to get it working. More recently, the awesome Raspberry Rabbit has taken up where Bromix left off and started adding his hacks into a zip, which can be installed from kodi.
Raspberry Rabbit is putting his fixes up on YouTube and as of Feb 23rd, I’m using his mod & everything is working as it should. Today he has added a bunch more of generated API keys into his zip, so this should work in the interim until a more elegant fix is implemented. I’m going to look into this myself as I didn’t realise how much I rely on the YouTube kodi plugin until the past week.
If you want to grab the latest Raspberry Rabbit version, head over to his github page at https://github.com/rasberryrabbit or download the addon itself directly from https://github.com/rasberryrabbit/plugin.video.youtube/archive/master.zip
If you are interested in getting this working there is a lot of chatter over on the Kodi forums so go & check them out at http://forum.kodi.tv/showthread.php?tid=200735&page=218
Steps I used to get this working.
1. Go to your kodi profile folder, go into addon data and delete your youtube folder
2. Download the Youtube Master version linked to above
3. In kodi, go to video addons > Get More > use the … button to go back two folder levels and install from zip
4. Select the Youtube Master zip downloaded above & let install
5. Open your new YouTube addon via Video Addons and click sign in.
6. Authenticate twice with the codes shown over at https://youtube.com/activate
7. Enjoy your working version of YouTube for Kodi.
If you run into any issues let me know, I’ll update this post as things change. Like I said, I use this addon daily so I’ll always be up to date on the latest developments until it becomes stable again.