Any update on this? Did the info I provide prove at all useful?

See attached zip for requested info.

Regarding MS System Graphics settings, I did not have an eGPU option. Below are results from the choices available to me while "Use Shared Surface for Viewport" was enabled in Octane Blender preferences:

Let Windows decide: Viewport Failed to render.
Power ...

Device-Prefrences.png

NOTE: Before I realized the problem seemed related to the "Use shared surface" preference, I did try a number of different combinations in the Device Preferences using one or the other GPU's with various settings.

I'm also running my 3090 headless. But during testing I did ...

I'm having viewport rendering issues as well. And this is on a clean install of Windows 11 with a fresh install of Blender 5.2.2 LTS and Octane Blender 31.12. Other than Octane Blender and the default add-ons that come enabled with Blender, there are no other add-ons installed or activated. The ...

Working with 2026 Addon 31.0 Beta. When I get a chance I can try with other VDBs.

If I'm working on a file, made some changes, but did not save and then click on New - OctaneRender Startup (Direct Lighting or Path Tracing), there is no prompt for saving file. You lose all your edits! All the other options (New: General, Sculpting, etc..) correctly prompt you to "save changes ...

When I plug either Volume Medium or Standard Volume Medium into a Medium Switch node, it washes out and lightens those volumes significantly. Is this a bug or am I doing something wrong?

I haven't used or tried Neural Cache yet.

I'm on driver 581.57. My problems seem to be what is listed in the below thread, in which you also recommend against latest driver. That post describes my issue more precisely:

https://render.otoy.com/forum/viewtopic.php?t=85392

I do not have these freezes and rendering issues at all in Stand ...

On Windows 10, I am experiencing rendering suddenly stopping on Addon 2026 31 Beta. Strange thing is the render window stays open and keeps going but the image disappears and no new frames are recorded. It just kind of freezes without fully crashing. This seems to occur after a number of frames have ...