No Green Squares while using Knife tool

Title says it all. All I see is the red line, it is difficult to chose a starting location when I can't see the green squares. I did start a different file and tried on the default cube, it works there. So something is amiss with my file for the lesson. What have I missed?
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  • wrongwright replied

    Solved it.  I didn't have a face.  Swore I had one before but now realize I had restarted a save prior to adding the face.

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