Ok, this is driving me crazy! I'm on a 2015 Macbook Pro running El Capitan 10.11.6 with PM 5, build 18040.
Just bought a Canon 5D MKIV. Every time I plug the CF card reader into my computer, it launches the Apple Photo program instead of PM!! I've already gone into Image Capture and configured it to launch PM upon ingest with both my Mark IV and card reader, but as soon as I reformat the CF card it goes right back to launching the Apple Photo program. For some reason, I wasn't having this problem with my MKII.
Please help!