YouTube sign in equals reset

I am trying to sign in to my YouTube-account. I enter my username and my password, but then the whole system resets itself. 

What is wrong?

Read the relevant posts of this forum and see that you are not alone. There are some things that you can do but they have variable success. 

I had the same problem after the first firmware upgrade.It might have something to do with youtube changing the login names etc…

Basically delete you old youtube log-in on the WDTVLive and create the same one again, except this time with the full email address (that is assuming you have a Gmail account as your youtube login). Worked for me.