Plex failing to properly access EPG from VBox XTi 3442

Server Version#: 1.26.15772-7000
Player Version#:
Tuner Make/Model: VBox XTi 3442 Live TV Gateway
Guide/Lineup name:
Using XMLTV?:
Channel number/Name:

Plex Media Server is failing to properly access the EPG from VBox XTi 3442, preventing DVR display/recording most local commercial channels in Sydney, Australia.
The listing of Plex Officially Supported DVR Tuners includes:
VBox XTi-3442 (DVB-T) • • • • •
When pointing VLC Media Player at every Live TV channel output by VBox XTi 3442, whether using Plex EPG for Sydney, Australia, or a separate EPG from http://xmltv.net/xml_files/Sydney.xm.l, VLC correctly displays each channel with correct audio, etc. Plex, on the other hand, can only access a couple of the lower ordered channels, and fails to connect to, or Playback most other channels (particularly the commercial channels for the 7 & 9 groups).
As such Plex’s claim to support the VBox XTi 3442 as a DVR Tuner is WRONG!
I have done a lot of work over the last few days with the Aust/New Zealand distributor of that device to identify the problem. I’d be happy to provide any material requested by Plex Support to assist in fixing the problem.