Just upgraded to the new 24 build and still having problems with the Shockwave plugin, still get a popup that says it's slowing down my mac and I get the spinning beach ball. This is really a pain and I'm surprised that with so many complaints that the Opera people cannot fix this.
I've uninstalled the Flash player and done everything I know how to do, followed all the suggestions. No luck.
There must be thousands of people who have this problem and have just given up and gone to another browser which is what I will have to do. I like the features of the Opera browser that no other browser has, but it become such a pure pain to use that I'll just have to go back to Safari.
Please, Opera people... fix this. Thank you.