A fixed version was put on the downloads page about an hour ago.

Unfortunately it looks like they had to roll back some features like scatter on surface and scatter in volume. Hopefully those will be back soon.

Using any of the common surface materials (e.g. Diffuse Material) on a mesh causes Octane Server to crash.

The resulting error message in the Blender viewport is this: Error in Render-server at address "127.0.0.1". Running Blender from terminal and reproducing the crash gives this message in the ...