in my Lubuntu 13.04 (with Gnome Shell 3.8), Flash videos won't go to full screen in certain Flash players (i.e. on certain sites). - Actually in most players, that means it doesn't work at all. Upon left-click on the fullscreen-button, I see a flicker as if it did got to full-screen, but then it stays standard size, kinda like a pop-up ad being killed by ad-block. - Some players have a "toggle fullscreen" option available on right-click menu, this is the only option that works for me now. In this case, I have to press and hold the right mouse button and release it over the "fullscreen" menu entry. The menu disappears when releasing the mouse button. - Only exception I found so far: Youtube, which works normally with left click on the fullscreen-button. My current Flash-plugin version is 126.96.36.1995ubuntu0.13.04.1. I wonder if Gnome Shell might be messing with Flash? Is anyone else experiencing this problem? Edit: this problem is present in Firefox, Opera and Chromium browsers. The graphics card I'm using (as reported in Gnome settings > details) is GeForce 8100/nForce720a/integrated/SSE2
I found the following solution which worked perfectly for me:
Workaround fo this:
Solution from: https://plus.google.com/100368718538258540940/posts/eJWwPj8B4dX (last post)
I created a devilspie script to make flash play videos full screen in Chromium and Firefox.
Save the following snippet to a file, make it executable and run it. (Tested on Fedora Linux 19 using yum instead of apt-get)