Hi everyone,
For several weeks, the contextual window to pause, play next or previous video while listening music on YouTube (that appear using the play/pause, next (>>|) and previous (|<<) buttons on my keyboard -- the window in the top left hand corner with the thumbnail of the video and those 3 buttons) can only play/pause the current video, i.e. the next and prev. buttons do not work (and their icons are gray, disabled).
How can I fix it ?

(I'm sorry for my bad english, I hope I'm clear in my explainations...
I didn't manage to find a topic dealing with this issue, maybe it already exists, in which case a link would be enough !)

Thank you in advance !