I'm using Blender 2.79 rendering with Cycles. I've set up a Shadow Catcher plane which appears to be rendering correctly when I do a PNG RGBalpha render. When I try to make an OpenEXR render and import into After Effects CC 2018, I cannot get my Shadow pass to appear without the Shadow Catcher plane appearing as a white solid. The world is appearing as black in the shadow pass, and the shadow catcher is appearing as solid white, so there's no way to composite this over my video footage as far as I can see (multiply, screen or add won't get the desired effect).
Here's how my Shadow pass looks in After Effects