Comment 5 for bug 148073

Same as mentioned above happens to me. The fullscreen video is showed in a small window instead. Yet, when I maximize the window, still the exit fullscreen button is shown in the top-right corner and working as expected.

The reason for this seems to be the compiz workarounds plugin. The legacy fullscreen option is on by default. When I turn it off, everything works as expected apart from some flickering when the fullscreen player controls are shown and then faded out.

I am also using nvidia-glx-new on a nVidia Corporation NV43 [GeForce Go 6200/6400] in visual effects "Extra" mode.