Hi Jeff, You can send an image to chimera-users. Messages over 40 Kbytes have to await approval before posted though. Solid rendering has no directional lighting as you can verify changing the light source direction using Tools / Viewing Controls / Lighting. The default solid rendering mode uses OpenGL 2D textures stacked up along the data axis (x,y, or z) most in line with your view. You probably are seeing artifacts related to that. You can try switching off "Solids using 2D textures" in the volume dialog "Solid rendering options" panel. With a high-end graphics card that will use 3-D textures that don't have as many artifacts. If your graphics card does not support 3D textures you will just see an outline box with no data. Tom