Hi @Steve_Nyhof! First of all huge thanks for this incredible thread. I learned so much and everything you've provided encouraged me to take the plunge and start working on my own renderings directly in CA.
Please see the attached screenshot. The rendering is not complete but that doesn't change the outcome. I'm getting those light stripes and the dark horizontal band on the background image. I tried changing the sun position, the image position and the image orientation to no avail. It doesn't happen with the spherical backdrop. Applying the backdrop has no effect on the stripes. I'd greatly appreciate any pointers any of you could provide please.
Best,
Onur