TC15 It seems to me that if I draw a solid and subtract something from it, that I lose the ability to move it to a new layer ... sort of.
In particular, I have drawn a flat rectangular solid (think sheet of plywood) and then cut a hole in it by subtracting a smaller rectangular solid. This is drawn in layer Base. I then create a copy offset so that the two are side by side and select the new one and change its layer to Tile. If the Tile layer is not then visible, it disappears as one would expect, but if one then hides the Base layer and make Tile visible, there is nothing there. If, however, one makes both Tile and Base visible, then the new copy is visible and if one selects it, it says its layer is Tile.
Annoying, since it means recreating anything like this that I want to move or copy to a new layer.