At a quick glance, I appear to have completely bungled the input validation of the refresh flag
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You're missing the wfm suboption, which currently should have caused fbink to abort with a relevant warning, but that check is busted, and the final sanity check has its logic inverted, so, double fail on my part here ;p.
TL;DR: Try with wfm=auto, and I'll fix that check when I get back to my computer
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