Render hangs with OctaneRender for Blender Addon 2026.3 - 31.7 macOS
Posted: Wed May 27, 2026 6:44 pm
MacBook Pro m5 Max 64 GB Ram macOS 26.5
After having downloaded the latest plug-in and server, the render never starts whether in viewport or render.
A Codex query produced this response
I found the cause: the Octane Python add-on and its compiled binary are out of sync.
The viewport startup fails with:
TypeError: start_render(): incompatible function arguments
Python called: start_render(cache_path, is_viewport, use_shared_surface, enable_realtime)
Loaded binary supports: start_render(str, bool, bool)
That means the upgraded Python plugin at:
octane/core/client.py (line 87)
expects a newer octane_blender.so API than the binary Blender is actually loading from:
octane_blender.so
I also verified:
Blender is 5.1.2.
Octane add-on reports OctaneBlender 31.7.0, SDK Octane 2026.3.
OctaneServer relaunches cleanly and activation is OK.
The clean server handshake works, but viewport render still fails at start_render.
There are Blender crash reports from this morning, including the one I reproduced at 11:16:47.
After having downloaded the latest plug-in and server, the render never starts whether in viewport or render.
A Codex query produced this response
I found the cause: the Octane Python add-on and its compiled binary are out of sync.
The viewport startup fails with:
TypeError: start_render(): incompatible function arguments
Python called: start_render(cache_path, is_viewport, use_shared_surface, enable_realtime)
Loaded binary supports: start_render(str, bool, bool)
That means the upgraded Python plugin at:
octane/core/client.py (line 87)
expects a newer octane_blender.so API than the binary Blender is actually loading from:
octane_blender.so
I also verified:
Blender is 5.1.2.
Octane add-on reports OctaneBlender 31.7.0, SDK Octane 2026.3.
OctaneServer relaunches cleanly and activation is OK.
The clean server handshake works, but viewport render still fails at start_render.
There are Blender crash reports from this morning, including the one I reproduced at 11:16:47.