I have more information on that problem. It is not only Flash - it is due to Unity itself. Look at the images attached to this post to see what problems i have encountered. (Yep, it is due to my two monitors!)
** Attachment added: "Overlay.png" https://bugs.launchpad.net/unity/+bug/737721/+attachment/1933676/+files/Overlay.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/737721 Title: Various problems with Flash video in fullscreen mode (menu overlay, multi monitors) -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
