Hello. I have the same problem in Gnome Shell on Ubuntu 13.04 32-bit. This happens on both flash and HTML5 videos, but not when watching on youtube.com directly. For example the problem appears when video is embeded on other sites or posted on facebook.
Hello. I have the same problem in Gnome Shell on Ubuntu 13.04 32-bit. This happens on both flash and HTML5 videos, but not when watching on youtube.com directly. For example the problem appears when video is embeded on other sites or posted on facebook.