I’ve drawn the shape that you can see in the attached screencap. As far as i can tell, al the edges are co-planar in the red-green axes plane, and i was scrupulous in joining each edge endpoint-to-endpoint. But Sketchup won’t give me a face.
At the same time, you can see that I got a face with no trouble at all with the simple rectangle that I drew alongside as a test.
Using SketchUp v.14.1.1283 / Mac.
Any ideas? Thanks,