Subtitles not showing up .sub/.idx-format

Hi everyone,

I have a problem with subtitles. Since the last update they won’t show up when playing mkv-files. They are saved next to the mkv-file as external subtitles in .sub/.idx-format. If I download subtitles in .srt-format they show up normally.

Anybody having the same issues or any ideas on how to fix that?