Hi Jim, glad to know your back up and running on Youtube. The problem seems to be when the internet security program automatically updates your internet security software and thus blocks Youtube videos from loading (for some reason) and you need to disable internet security and refresh your browser to compensate. Because how can Youtube videos load one day and not the next when you haven`t even changed any settings? That`s my theory anyway.

Go to a Youtube video that you know does not load i.e. (Javascript is not running) and then, turn your firewall "OFF" (don`t worry it`s only for a moment) then go back to Youtube and click on the video that would not play, and now it should load. You may also have to refresh your browser (to refresh, go to the view menu).
Then go back to your firewall and turn it back "ON".
I sussed it through trial and error.