Last update has no updated Java
I cannot see properly most of the videos that I could see before, and everytime I try, the message tells me that the browser hasn't the latest Java Update.
Vivaldi does not use Java plugin since months, the support it was removed in Chromium code base (which is used by Vivaldi) more than a year.
Which URL is the page where the video does not play?
Exactly from where you are watching videos not working? any url?
Besides, you have to install and update java runtime by yourself