I have all 30 episodes on separate mkv files. According to MediaInfo the encoding used is the same on all eps Eps 1 ~ 5 and Eps 13 ~ 30 play normally. Episodes 6 to 12 play and show subtitles and sound but no video vision, just a black screen I have remuxed, extracted the vision, sound and subs and then remuxed to non avail. If I play them directly via a memory stick straight into my SONY TV or PC or iPad they play normally. I can't find anything amiss with any of them <insert emoji pulling out hair etc> Attached episode 5 mediainfo file - it plays ok Attached episode 6 mediaiinfo file - plays but no video vision The 30 episodes are on my internal disc 2 All other files play ok