Hey Bob,
Make sure the plot window is set to either the 2D points or 3D points view (this has tripped me up before—it doesn’t work if you’re on Reprojection Error, for example), and select (with Hold Shift + Left click in the plot window itself) the frames you’d like to toggle interpolation On for. Then when you click ‘Active’ in the points window, it should then calculate the interpolated values.
JD
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