I just found a problem of 009 build concerning about subtitle display. Embedded subtitles (i.e. video files with subtitle track in the file) could not be shown during video playback even when subtitle display is enabled. No problem if subtitle is resided in a separate file (.srt). Also no problem for the 7.90 Krypton build.
If I extracted the subtitle from .mkv file (using SubtitleEdit), save it to .srt format and put it in the same folder, subtitles could be shown. I haven't rolled back to previous back and checked. The reason I didn't discover it sooner is most of the case I used external subtitle files resided in the same folder.
Do I need to post a log for this?