I had a quick search but only found threads I started years ago about
render layer issues!
well guess what I'm having another one.
I have a scene split into three Render layers, I want to render two of them using mental ray and one the software renderer.
I'm sure I did this yesterday but today if change one layer to software render they all change and vice versa.
i'm on osx running maya 2009 I've restarted maya and mac and can reproduce the issue in a fresh scene with two poly cubes.
I was under the impression I could have a different render engine for each layer is that not the case???