Did you make any progress with the DLNA side of things?
I just got my DMR-BWT835 and so far the best I have found is to use Serviio to do the sharing and transcoding using the Panasonic BD profile , and that seems to get a lot of media working, but occasionally that profile does not work as Oblivian suggested.
What profile is everyone else using?
The one thing I can't seem to get working is any form of software as a dlna "control point".
When i try to use any form of control point/remote app to send the set up the media stream from Serviio to the bwt835, I end up back with "cannot play" error.