"It may have been refractive or reflective bounces,
Sometimes these get set to 0 - which means not light passes through transparent, refractive, glass, and no light reflects. Reset to defaults sets them back to 3 and 6"
"The problem I had was primarily having a window that was semi-transparent and reflective. Since there was window shades on the inside, I wanted to see those and the reflections of the trees in the yard. After changing the values of both the…"