I'm using a macbook pro, Yosemite version 10.10.5. I am using Photo Mechanic version 5.0, and I have raw photos on an external HD. When looking at them, I can't delete them. I hit delete and it says "do you want to delete" but then doesn't actually delete the photo. I can manually delete the photos, and working with photos saved on my computer hard drive I can delete them. I have checked the permissions for the HD and I can read and write. Any advice? I don't have enough space on my computer to work with the files and then send them over to the external HD. Normally I do it all on the external HD.