Hey there! 

Every time I use "this widget" playlist source my player disappears. 

Once I switch to "playlist post" problem goes away. 

What I need is to play mp3 file from post meta using mp3 player widget.

And on one hand I can't do it using "playlist post" (it seems that there's no such feature), on the other hand "this widget" bugs player. 

Any solution will do, both unbuging "this widget" or doing what I need using "playlist post" for post meta.

I attach pics to show how it behaves on the switch. 

Alright, nevermind, this is quite doable through embedding shorcode. 

I saw your article about modifying shortcodes but still couldn't figure out how to do 2 things: 

1) Get rid of this title (pic)

2) Irrelevant to shortcode but: how can I substitute this "Track 1" in sticky player, where should I change what? (pic)

Nevermind again, I clicked my way out! :D