I think it was a technical problem at You tube's end.
I was online when it started affecting a few channels but as time went on it spread further across the board. after poking around and trying a few things it seemed to centre around a problem with the front pages for channels.
I don't think it was anything deliberate on You tubes part just a tech glitch.
Last Edit: Apr 3, 2018 19:52:07 GMT by poly: edited to correct a badly chosen phrase that could have caused confusion.