I'm having an issue with the shadow catcher. It works just fine in the live viewport, but when I go to render it disappears completely. Any idea what's going on?
My setup is Octane standalone 1.10
Max Plugin 1.10
GPU: GTX 570
Here are screenshots illustrating the issue. Exact same settings, but the shadow catcher disappears when I press render.

Live Viewport - Shadow catcher working and appearing

Render Viewport - Shadow catcher disappears
Also, the output for the render was set to PNG, so as far as I can tell it should work. Amy ideas?