Scott,
* Edit/Settings/ RenderView /General/ unselect LOD Threshold. * Edit/Settings/ RenderView /General/ Change Lock Interactive Render to 0. No, it didn't make any difference. I had already been through most of these options quite thoroughly and found no improvement. However, this morning I had to reboot my machine for a bunch of mandatory updates that windows decided I needed and now the problem has gone. The little countdown at the bottom left appears and the screen refreshes instantly as it used to do instead of waiting for ages. I can't explain what has changed, but as long as it carries on working. I'm happy. Thanks anyway and Sorry for the false alarm. JB
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