@unknownuser said:
Your suggestion to reset the model axes seemed like it would be helpful, it at least sounded like it could be the solution. However, the option to reset the axes is greyed out; I presume they are then already in their default state.
I did write, "If the model axes have been shifted ..." Since you haven't shared the SketchUp file there's no way I could know whether you had moved the axes or not.
@unknownuser said:
There's two sets of coordinate systems at play. One is the photomatch - pair of red and green dashed lines, red and green vanishing points, the yellow horizon and the yellow Origin point. The other is the model, or 3D space, with red, green and yellow axes, meeting at their own Zero point.
Not really. When you are setting up the image for Match Photo you are setting up the camera to match the lens used to make the photo and aligning the image to the model axes.
I have no way to identify how you got it shifted.
I guess I will leave you to it.