I went to http://www.radioio.com/ and selected a channel; music began to play immediately. It took me a while to locate this on the top right of the page
You don't get this?
P.S. you mention "ads" - I don't see any on that site...?
Thanks for the reply. I get the background wallpaper in that window, as below, which shows that flash is working to some degree. But as you can see none of the text or the controls appear. There are onscreen advertisments with images and motion that run in flash, such as the scion one shown, plus another at the top of the screen (which I cropped out in this screenshot). I've had the same thing happen in each of the browsers I've tried and with various versions of flash.
I cannot reproduce this on any browser, including Waterfox.
I don't know what is causing this; all I can recommend is a clean install as described in http://forums.adobe.com/thread/928315
Another thing you could try is the Flash Player 11.4 beta http://labs.adobe.com/downloads/flashplayer11-4.html
Thanks for trying. I already did a clean install but will try it again. I'll see if installing flash 10.3 gets the radioio desktop app to work (the player in the browser just said flash was out of date when I rolled back to 10.3 yesterday). I'll give the beta a try also and may even try Chromium to see if the manual flash installation it requires helps at all.
Clean install with flash 10.3 didn't work, for the desktop app or the browser player. Another clean install with 11.4 beta didn't work. One thing I've noticed is that clicking the background/wallpaper where the player controls should appear refreshes the advertisements on the rest of the screen, but still no music or controls. Not sure if Chromium is worth a try at this stage.