@The Toerag
Please check if there is another title that has the similar runtime and other audio/subtitle features as the current title, try to choose that one to try again. 
Though MPC-HC does play the episodes with the DTS-HD MA audio track, and shows the commentary track as being there if you want to use it, though no menu options with MPC-HC
Do you mean that the same output file created by DVDFab 10,  can play with the DTS-HD MA audio track in MPC-HC, but no DTS-HD MA audio track available in Player 5 or PowerDVD?
Please open the copied BD file of disc 1 in Windows Explorer, open ...\BDMV\Stream, find the largest .m2ts file, use Mediainfo tool to analyze it and post the result as attachment here.
Thanks.
Regards,
Mona