Hi
I run OS High Sierra 10.13.1 on my mac and Photo Mechanics 5.
I have a Photoshelter account and have used PM file uploader to upload to galleries on my Photoshelter account without any issues. After updating OS to High Sierra 10.13.1 i have the error attached in a screenshot. The same error appears on both of my macs.
I have tried to delete the account in file uploader and make a new one....it does not help.
Lars