This worked perfectly up until a couple of days ago. Instead of the player, I just get a dark grey bar where it should be.
I've tried disable all plug-ins and the only one that makes a difference is disabling JetPack... in that the post displays the shortcode as actual text. Also tried changing to 2013 template, with no change in the problem.
Example post to see the issue: http://www.moshville.co.uk/new-band-of-the-day/2013/10/new-band-of-the-day-effloresce/
Should be a player near the bottom after the main article text.
I've also just tried a test post on three other blogs, all with the same result (different plug-ins, themes, etc.)