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I've tested it in several scenes (even with a default blender scene) and I always get just the same result: if I try to render the Z-depth image (Kernel type: Info-channel > Z-Depth) in Blender Octane Edition I get plain white image. At the sme time when I use "Rendered" Viewport Shading Z-Depth image looks fine. It seems like "Z-Depth max" parameter is being set to a value close to 0 during the render for some reason.
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A. OS Windows 7 with lastest updates at the current date
B. GTX 680 4Gb + GTX 770 4Gb
C. 24 Gb RAM
D. Nvidia GeForce Game Reay Driver 378.49
E. OctaneRender Standalone 3.05.2
F. OctaneRender plugin for Blender v2.25, OctaneServer v11.21
G. Blender 2.78a Octane Render edition

The problem is still there

Strange but I'm rendering it without a problem. It renders the same in editor and in final render.
Make sure that:

• - "Z-Depth m" parameter is set correctly – something above like 10 or so
  - Blender's Color Management is Off –> Display Device set to None, View – Default, Exposure – 0, Gamma – 1, Look – None

Well, I found that this problem also appears in Standalone... So sad.

This two images are what I see in OR Standalone Viewport and image from saved file.

J.C wrote:Strange but I'm rendering it without a problem. It renders the same in editor and in final render.
Make sure that:

• - "Z-Depth m" parameter is set correctly – something above like 10 or so
  - Blender's Color Management is Off –> Display Device set to None, View – Default, Exposure – 0, Gamma – 1, Look – None

What output file do u use?

Hmm, seems thet there's some EXR problem... If I choose PNG output, it saves fine.

In EXR it stores 2 channels: A (for alpha I guess) and Y.... and they are seems to be the same:

I see no difference when saving to OpenExr. Everything is ok.
Here is an example file:

This is really interesting. Try to turn OFF the Octane imager in camera setings and press F12 again.

Yes , interesting. Looks like we must not turn it off

I wish it could be so simple for the Standalone ))