Yes, I'm using my NAS as the DLNA server. It used to be the case that I was unable to change audio tracks, although the TV could handle multiple audio tracks when I used the same file via USB instead of DLNA.
Please hav my software version as following:
https://dl.dropboxusercontent.com/u/430331/LG%20webOS%20DLNA/IMG_3633.jpg
https://dl.dropboxusercontent.com/u/430331/LG%20webOS%20DLNA/IMG_3634.jpg
This is an LG 42LB671V.