I think I am pushing this project to the limits of Octane, but not really sure. In short, this scene is probably 95% lit by indirect lighting through all of the pushbuttons. Sure, there are four big direct lights (the big red rectangle and another three out of camera view), that offer by far the majority of illumination power, but quantity-wise, the pushbuttons are the major burden. And possibly because of this, there is flaky behavior in the rendering of shadows (see image). They are either not getting completely filled in, or they are getting inverted in brightness. Also, all of the blue pushbuttons for example have the same power setting, but some render very quickly, while most others take forever to render.
Has anyone seen this behavior before and if so, does anyone know of a solution?