OK This is a problem. We sometimes use "colors" on a node to represent displacement amount. Not because we want to, but because the node accepts colors, not numbers.

Here I'm using a "Clouds" node to drive a displacement on a one-sided square. There are two squares. A white one with displacement is two inches behind a green one. The green one is flat.

The displacement moves some of the white on in front of the green. I get different results based on whether gamma correction is enabled or not.

First I'm showing Gamma=1. Observe the pattern.

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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)