I added an mp3 player jquery.mb.miniAudioPlayer to my wordpress and now all the single instances of soundcloud songs on my site no longer show up.
For example http://www.craigashby.net/january-31-2013/
All worked before the plugin. I deleted the plugin and now still haven't been able to get the soundcloud embed to work. There is a blank flash icon but no go. I have tried all the embed options including HTML5 and still nothing. It refuses to play nice no matter what I do.
Oddly the set post works just fine. http://www.craigashby.net/mix-sets/