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In Front view, with ORTHO On, I'm trying to copy the horizontal member somewhere up the Z axis. It will only allow me to travel in the X direction.
If I switch to Front Left view the copy operation will allow me to climb the Z axis.
Why? It's much easier to work in Front view as it's less cluttered visually.
In Front view, with ORTHO Off, I can climb the Z axis but that's more difficult with the mouse making excursions left and right while climbing.