I have the same problem, since approximately 6 p.m. today. The names look like this by all Youtube-videos:
_1080p.mp4
_720p.mp4
(Deutsch_ASR).srt
(Englisch_ASR).srt
No txt-File as well.
Has YT changed something or it concerned the update (Update was also about 6 pm today for JD2, Windows 8)?
I wrote about the problem already in the german support (but not in the extra thread):
https://board.jdownloader.org/showpo...0&postcount=16