The Things My Computer Does Confuses Me 2

So after the update from YouTube I keep getting these errors... am I the only one?

It doesn't last long and but sometimes I have to reset the page in order for it to work right,

it seems that again another platform is making updates without long term testing first.

What makes me the most upset is they deleted one of my videos without prompting me first.

The Tutorial is complete, if you'd like to learn here's the link: MMD A Pose to T Pose and Back to A Pose Example