I have an app that's playing several files once the call is answered:

<action application="playback" data="/usr/local/woow-vm/sounds/en/pinconf.wav"/>
<action application="playback" data="/usr/local/woow-vm/sounds/en/1.wav"/>
<action application="playback" data="/usr/local/woow-vm/sounds/en/2.wav"/>
<action application="playback" data="/usr/local/woow-vm/sounds/en/3.wav"/>
<action application="playback" data="/usr/local/woow-vm/sounds/en/4.wav"/>

On v1.6.9 or older works perfect. I tried on last 1.6.x master form today 

and only first file I can hear being played. All other are not played and in logs 

I can see very fast:

switch_ivr_play_say.c:1910 done playing file /usr/local/woow-vm/sounds/en/1.wav

On the v1.6.9 this message is triggered at the end of the file. 

I will try to find the commit that broken this but help is appreciated. 

Silviu