[Framers] Videos won't play (FM12 on Win10)

I have several digital edition PDFs of documents that contain video tutorials (mp4 files). These tutorials played just fine in earlier revisions of these documents in Win XP. Since our IT group upgraded us to new Dell notebooks, running Win 10, the videos no longer play. Instead I get a warning

[Framers] switching from Frame 10 to 2017 with unexpected results

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