The scene appears dark in the viewport

juliano.cruz_97bea1265e

Why do my scene, characters, and all the objects appear dark when I enable the "preview light" option? Is it something in the light settings, environment, or the tone mapping?  I'm viewing my scene in "Texture shaded". All other my files work fine. I need to see preview light to preview some lights behavior in my scene.
 

See the example below in the attached screenshot:

Richard Haseltine

Preview Lights is actually on by default, and it does not include anything but the first seven actual lights (light nodes, Distant, Spot, Point, or Linear) so any emissive surfaces or environment lighting will be ignored, as will light nodes later in the load order.

johndoe_36eb90b0

Richard Haseltine said:

Preview Lights is actually on by default, and it does not include anything but the first seven actual lights (light nodes, Distant, Spot, Point, or Linear) so any emissive surfaces or environment lighting will be ignored, as will light nodes later in the load order.

And still Daz Studio does not remember this damn setting. I hate it so much. How hard is to persist it?