Many thanks!

NOTE: Using Octane Render for Blender v2.06 - 6.5

I have set up an HDR texture as the World - Environment presets - Texture image using an Octane Image Node and it is working. In the Octane Render for Blender manual (http://render.otoy.com/manuals/Blender/?page_id=77) it shows a "Rotation:" section ...

That did it!

Many thanks, off to render some scenes now...

Details on my issue:

Software: Octane Render 2.06 Standalone (x64)
Octane Render for Blender 2.06 - 6.0 (x64)
Blender Octane Edition - 6.0 (2.71.5) (x64)

Problem: Start Octane Server, open up Blender Octane and use default scene (the cube and point light). Changing nothing, I simply select ...