SubtitleEdit: mysterious settings after upgrade, need help

For over ten years, I've been using SE to rip, sync and produce subs. Now, after upgrading to 3.6.10, when I click Start OCR, instead of running through the movie, SE wants me to confirm characters one by one, as in the screenshot.

What I am missing? What setting do I need to change?

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https://preview.redd.it/ea19k349h2aa1.jpg?width=1364&format=pjpg&auto=webp&v=enabled&s=62e52619154238982408628776fdc3e2bc1538d8