I use this site on my laptop http://www.radioplayer.co.uk/ and when I accessed it via the phone it said flash player required, so thought I'd try with that, but I can't get any of the 3 versions to work. Actually looks like it's playing (current song showing as per on laptop), but no sound. And volume is up and I checked with headphones. Nothing.
I've tried rebooting after each install to no avail. Also I'm sure in my first attempt with v11 the app appeared in my tray of applications but after that all I get is the Flash Settings icon there.
I'm running an unlocked, rooted OMC on Atomic v2.5
Are you using dolphin browser?