Hi, I have found a work around the problem with Text To Speach function.
Smartthings plataform have problems to convert tex to to audio long time ago and they have not a date to fix it
A replace function calls a google service to convert on the fly.
If you are a user: You must to update the DLNA PLAYER device
And to use the modified smartapps with the new function. (I have mod some smartapps from smartthings )
This must to be a temporal fix until SmartThings fix the problem.
If you are a programer: You must to add the new function and replace the call of the old function with the new one on yours smart apps