All of the anime that I have kept on my external and even some I haven't gotten around to that happened to be .mkv format don't work and I do not know why. At first, I just looked at the Anime I had not started yet or finished and I was cool with deleting those, but stuff on my external is what I want to keep and it doesn't work either. It'll be a pain to download it all again, so how do I fix it? Edit: Was downloading Angel Beats as well and the same problem again. x.x Only with .mkv though.