Most of the thumbnails are dependent on what part of the movie is being used for the still capture. If it's using the first few seconds of the video, it may still be a black screen. I'd be interested to know how many movies you had (estimated) when the thumbnails seemed to work, and how many are detected as they don't.
What settings are you looking to change for Media Play?
There is support for subtitle tracks, and that list is on page 51 of the manual. For convenience, I've added a link to that page here. On the top list the subtitle formats that are accepted.
Audio tracks will work as well, but they do have to fit into one of the compatible audio formats, also listed in that chart.
First of all, kudos for making the only TV (that I'm aware of) that can play .mkvs, .vobs, etc. I'm really fond of the media play ability.
That said, I was wondering if you could explain why my tv wont produce thumbnails for the videos anymore. Not a big deal, but really useful for my kid who can't read yet- seeing a picture of what he wants to watch is very useful. Is there a limitation to the amount of thumbnails the TV can produce?
Also, why can't we change the video settings in "Media play" like we can for any other mode?
Finally, how about a firmware upgrade to allow the selection of audio tracks and/or subtitle tracks embedded within .MKV or .AVI containers?
Thanks for your attention.