Pixelated 3D view in Volume Rendering

I hope this will work. I found a smaller data file that showed the same output.

  1. Loading using SlicerMorph - during Volume Rendering, pixelation of the image is seen in the 3D view when stationary.
  2. When I load the series of png files using the drag/drop and unselecting ‘Single File’ - during Volume Rendering, the 3D view shows a black box that turns grey when manipulating the ‘Shift’ bar.

Thank you in advance.