So when I first started building, the glow fog was beautiful. It was subtle, you could see through it, and you could stack it to adjust opacity (an opacity slider would be better).
I could make all kinds of cool effects this way, namely, a subtly rainbow effect in my waterfalls!
But ever since the 64 bit update, the glow fog is very opaque. My lovely rainbow turned into crude colored marker streaks.
It did get fixed once since then at some point, but was then reverted back with a following update.