Hi John
I had the same problem with my TV, which is an LG Smart TV model 47LW5700-SA. So I solved the problem partially for movies and not for music files using Twonky Server DNLA, see tutorials on how to install this app on your DNS320 on the internet. You will need to install the package foz_fun_plug, so remind me. I believe this to be a bug still unresolved by LG. I used the tutorial in Portuguese, and I belivie don't is right for you.
Regards