export multiple problem

I’m using Mac OS Sierra 10.12.3 and Audacity 2.1.2, obtained from the .dmg installer. On occasion (not all the time) when I attempt the “export multiple” operation, only a subset of my labeled tracks are exported. Why is this, and what can I do to fix it? Thanks.

Do you have more than one Audacity audio track?

Are they region labels or point labels?

Obviously audio before the first label will not be exported if you have Export Multiple set up that way.

Can you File > Export Labels… an example of a labels track that creates this problem? Please attach the exported labels file.
Please see how to attach files to forum posts.