I'm using 12.04 classic Gnome. Lately, I have been experiencing choppy flash video playback. In youtube as well as in other sites. I tried installing flash-aid plugin for firefox and executed its wizard who installed another version of flash player player for me. But to no avail.
One of the answers that I found was to 'disable hardware acceleration'. Unfortunately, the 'settings' option while right-clicking is greyed out as well. I was not able to follow what they recommended in the following link:
How can I remove the choppiness of the flash video playback?