It works with the default theme. It even works with some of their other themes. Of course, they are disavowing any responsibility. Here's what they suggested:
"Regarding the post not displaying in single pages, please request that the developer looks into adding a filter to the_content at the top, which should add the player to the beginning of the content."
I'm trying to persuade them to look into this, but thought I'd mention what they said in case this triggers any thoughts/ideas.
Thanks,
Mike