the current version of Youtube app is 126.96.36.199 - update it and see what happens.
Tbh the Youtube app has never been bug free on my tablet, at first it had exactly as you describe nothing would load - I did all sorts and finally figured out it was my wifi router being the problem so try a different wifi connection and see what happens.
Once that was fixed it would take ages to load and now it no longer updates my history. I just think this tablet and youtube aint the best of friends haha.
P.s. is 777 in your name refering to Boeing 777? Jus curious lol.
Sent from Galaxy Note 10.1 2014 Edition via Tapatalk.