Elias Aarnio: I do not see how your advice is different from what I wrote I had just tried (which failed.)
Workaround:
For those desperate enough for a workaround, I can suggest this: install Google Chrome. Unlike Chromium and other browsers, it has its Flash built-in. Its Flash popup works fine for me in 13.04, standard Unity, for video conferencing using a commercial service which failed under 13.04 Chromium and 12.01 Chromium, even under gnome-shell.
Elias Aarnio: I do not see how your advice is different from what I wrote I had just tried (which failed.)
Workaround:
For those desperate enough for a workaround, I can suggest this: install Google Chrome. Unlike Chromium and other browsers, it has its Flash built-in. Its Flash popup works fine for me in 13.04, standard Unity, for video conferencing using a commercial service which failed under 13.04 Chromium and 12.01 Chromium, even under gnome-shell.