[TheShoe]

I have an MKV file with multiple subtitles, one of which I want to be enabled by default (without having to manually enable it).

I checked using a header editor and the default flag on the subtitle is set for the proper track.

VLC selects this track by default whereas Kodi does not.

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Why does Kodi ignore the "default" header value in MKV files?

[TheShoe]

Well, I think the headers in the MKV file were trashed so I re-ripped and set the default sub track and voila! all is well.

issue resolved. pilot error.