Octane Viewport greyed out after render

[Longbongosolo]

Hi, I'm having an issue where whilst rendering the Octane Viewport is normal, but as the render completes the image is replaced with grey and the toolbar is mostly greyed out. This happens with fresh scenes.

Using Blender 5.1.2, Octane Add-on 31.8.0 on Win.

During render...

Octane Viewport during render

When render finishes...

Octane Viewport on render completion

[linograndiotoy]

After a render, the Octane Viewport needs to be closed and reopened.

Also, please keep in mind that the Octane Viewport in Blender is mainly intended for debugging purposes, and it should not be kept open while launching final renders.

For regular work, you should use the standard Blender viewport with Octane rendering instead.

[Longbongosolo]

Thanks Lino. I would like to just use the standard Blender Viewport but I need to save the file as Multi-layer EXR with Cryptomatte and the Blender Viewport saved file will not open the Cryptomatte layers correctly in Photoshop and the Beauty pass color is different (see this old thread viewtopic.php?t=84777 ).

I've tried troubleshooting with a fresh install and fresh scene using the Octane Render Startup (Path Tracing) default scene.

If I start the render preview and open the Octane Viewport it works as expected but if I then go back to Solid Shading the Octane Viewport goes grey (expected as rendering is stopped). Then if I start rendering again the Octane Viewport will stay grey but indicate that it is rendering. As you mentioned closing and reopening the window refreshes it and it again works normally. But it still goes grey on completion if I do an F12 render.

[linograndiotoy]

So, I assume you are using the Save AOVs option in the Octane Viewport?

In that case, could you try saving the AOVs directly from the Octane Viewport with only the Octane Preview running, without launching a final render?

Also, if you enable Always Use Camera Resolution in the Camera Options, the Octane Viewport will display and save the files using the currently set image resolution.

Please let me know if this helps.