I've got an issue with the shadowcatcher when the render finishes. I want full transparency with just a backplate option in the material. I render to Picture Viewer and all is fine - complete transparency everywhere I need it right up until the last moment where it finishes the last pass then it adds in (darkens?) - and adjusts the 100% transparent areas where the floor object is to a few percent off - breaking the ability to composite properly. Its as if it runs a tonemap right at the end - but I don't have any tonemapping selected...
