It doesn't work on my EVO. I uninstalled the 10.3 update and now my flash objects work again in the browser. To be clear, I am rooted with Myns Warm. Don't know if that makes a difference but 10.3 definitely does not work in my current set-up.
Flash player has an update in the market but it just listed security fixes but I didn't go to the website to see the whole thing. Might give it a try now just for the hell of it.