This is a great, great plugin, and before I upgraded to the latest versions of WordPress and AudioPlayer I had no problems at all.
Now, though, after upgrading both, I am also having variable success. The player works fine on one post on one blog, and works fine on another post on another blog, but in different posts on both it will only insert a link, not the player.
I cannot insert the player through Firefox at all. I inserted it through the interface once only in Safari. In the other case I inserted it manually, to no avail.
Here are two things that may be relevant:
1) the troublesome blog is a literary journal which goes live in February so all the posts are scheduled. I can view them only in preview and only from the admin login.
2) the sound files in each case are different sizes. The one that works is 500 KB and the one that doesn't is 1.3 MB I can't see why that would matter, but it is the only difference I can find.
If I can't find a workaround before the issue goes live I will have to install a different player but I really don't want to do that.