Today as i tried to put another video on Dtube i find a problem. When I upload my video, choose miniatur, headline and description I find a problem with submitting to the blokchain. It showed this massage:
I repeat this procedure several times without any success.
Than I tried to log out and than log in again to my user account. That fixed the problem and I upload my video successfuly nex time.
Apparently they was changing something about the passwords and you have to log out and log in again to make it all work like before.
I hope this trick would solve your error too :)