When I choose 3D View from the PCB Layout window, the 3D model appears in the bottom right corner of the screen at a distance.  The origin of rotation is far to the left of the board (it is at the center of the window), so the board revolves around a point far from its center rather than rotating about its own center. The 3D model appears in the center of the screen (as is normal) for a small fraction of a second, then moves to the bottom right corner.  I have made sure that no entities appear outside the PCB border. Anyone else seen this issue?  Does it indicate a corruption in my files? Thanks