Yea. The default shader settings on the EnvSphere were made long ago, before we could use HDR images. Almost all the images were JPG. In that case, managing the color-space-dependent manipulations were of interest to me, so I placed the Gamma In and Gamma Out nodes into the setup, and they are defaulted to 2.2

When using an HDR image, the Gamma In should be 1.0, not 2.2. The Gamma Out should depend on whether or not you have Poser GC turned on. If you do, the Gamma Out should be 1.0 - at least it should be if you want it neutrally presented. You can manipulate Gamma Out away from one for the purpose of artistic control, but lacking any intention to manipulate the outcome, you should have it at 1.0 and be using render GC.

Note also that the thread in which I said to connect the image to ambient was one in which the discussion happened to be talking about using images in general. However, if you're specifically using my shader setup, you should not do that. In this shader setup, you use the HSV node's Value property to adjust the apparent brightness of the image. You can also use the HSV Saturation and Hue parameters to adjust the saturation and hue of the image.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)