Error, Render not showing in the Octane render Viewport

[andrebonnice]

When hitting 'open viewport' in Octane the render doesn't show up in the render viewport. It only started happening when I upgraded my Octane to the latest version. See attached image for reference. There are objects in the scene, I've been using the plugin perfectly for a few years now, this is the first major error I have encountered.

Rhino: Version 5 SR14 64-bit
Octane version: 4.00.0.100

[face_off]

Please check that you have a graphics card enabled with Tonemapping enabled in the Devices tab->Open Device Settings panel.

Paul