I noticed that a few YouTube videos refused to play.

Having searched around, I came upon a thread in the XBMC YouTube plugin code repository;

https://code.google.com/p/youtubexbmc/issues/detail?id=95#c217

martinpe…@gmail.com  linked to an updated YouTubePlayer.py file;

YouTubePlayer.py

Copying this file to your XBMC Addons directory, over the existing file, fixes the problem nicely.

Evidently, some YoutTube videos have a ‘$’ in the JS function name, which confuses the original plugin.

This plugin replaces the ‘$’ in the function names with ‘_S_’

Hope this helps somebody!