I use Gnash exclusively (is it even possible to have more than one "Flash" player installed in a browser?).
I mostly use it for YouTube, where there is mostly no problem.
Where I now find I most would like to use it, but cannot, is in Facebook.
Now, sometimes, someone just uses YouTube (either a link or embedded, somehow, I don't know), and I can play those right on the Facebook page.
But a lot of the time, there is just a box with a picture and playbutton, and if I try to play that, it tells me that "Flash Player Upgrade Required".
Most of the time when Gnash doesn't play something, there is just a blank rectangle, and I can riight-click and find out stuff and learn (probably) why Gnash cannot play it.
My guess is that Facebook is not letting Gnash even know that there is a video there.
Is this something Gnash can "fix"?
Is there some way of getting around it?
If it is just some other type of video that Gnash cannot (yet) deal with, I would suggest that, Facebook being so popular, this other type of video would be a good next priority for Gnash to work on, as I am seeing more and more of them as time goes on...