Same issue with me. I have the premium version and until yesterday I had used an earlier version of the app (with Chrome v35).
Now after upgrading to the new Chrome (v54), subtitles no longer appear. Today there are no subtitles for the same videos that had a subtitle yesterday. On the computer I see the message of not being able to load subtitles from opensubtitles.org.
What happened guys? 4 months, since first bug report, is there is no word on when it would be fixed???