OK; thanks. I succeeded in dragging a screen shot as you see here. I think that is with default canvas. This is all very strange as I am now getting inconsistent results. I am thinking that the exact sequence of clicks may be critical. It appears that even when it does work, I see no result until I move the mouse. This is the sort of way that different software can work differently in more ways than I would imagine. But it does seem to be similar now regardless of view…switch canvas to default or to openGL
Thanks again.