I have the Panasonic 65VT50 with following under about / firmware:
TV: 1170-1000
Status1: 01000-00009
Status2: 00000-00000
Status3: 0.50.2
HDAVI Control: 5
ESN: PCTV000121==A6393BD9804BA431DA2E

I go to Viera Tools and select DLNA.
I choose video and then browse to the folders.
I then step through the folders trying to play various videos. Some types would be MKV, AVI, XVID and maybe others.
I can tell the ones that will fail with the "file not found" when I tell it to start streaming, because the icon next to it is an exclamation point.
If I see something other than the exclamation point it will stream.

I followed this link on logging:
http://forum.conceiva.com/showthread...nostic-logging

I will email this to support, but thought there may be some feedback.

It looks like the device profile is listed as Panasonic Viera (2011 Models).

Thanks in advance.