Panasonic Viera and Serviio

I have a Panasonic Viera TX-L42D25B TV and a Windows 7 PC. Many thanks for Serviio, after a search for DLNA servers it seemed the best choice. On the TV through Serviio MP3s play well and also JPGs. I have set 'General DLNA profile' and unchecked the online metadata boxes. Video seems to work around half of the time. When it does it works perfectly but many of my avi files are XVID and some of these again work fine, some start and after a few seconds stop and others do not play at all with message about not being able to handle the file. I have looked at these with GSpot and there seems to be little and in some cases no difference between those that work and those that do not - apart from a few bytes in file length. Anything else I can try?
Intel UPNP Tools 'Device Spy' does not show the TV - my wife's PC which is similarly connected by homeplugs through the router shows up. This means I cannot get the TV data that you may want. Any ideas?
Intel UPNP Tools 'Device Spy' does not show the TV - my wife's PC which is similarly connected by homeplugs through the router shows up. This means I cannot get the TV data that you may want. Any ideas?