On the app and C198 it just brings up this twirling circle and never loads. I haven't reported the issue personally but if you do a search on this forum for YouTube there is plenty of other reports that prove that YouTube is not just working. So no it's just not for me there is several VM customers seeing the same error.
This is what I did to fix it.....rebooted the v6 box giving a good 20 min off before starting again. Still no luck with YouTube. Then changed the connection from WiFi to network cable straight into the vm router and voila it starting working again.... hope this helps someone