I just installed PS 2018. As soon as I did that I tried to continue my work flow, which includes using droplets. I took at tif file and dragged it onto one of my droplets, and the droplet opened GIMP of all things (I keep it for a few obscure things I won't go into). I check to see that PS 2018 was the default for file type tif, and it is. Still, every time, with all image files, my droplets try and open GIMP. Then I opened PS 2018 and ran a droplet again. It turns out that when PS 2018 is open, that the droplet works, when it's closed, droplets try and open GIMP.
Then I reinstalled 2017 (2015.5) along side PS 2018 because 2018 has an issue with the healing brush being super slow that was so bad I couldn't keep working. Next time I used a droplet, it opens PS 2017.
MAC OS 10.12.6
Any input apprecieated. Thanks.
Did you generate the droplet using Photoshop CC 2018 or a different version of Photoshop?
I created the droplets in the previous version of Photoshop, pS 2017. I have never had to create new droplets when upgrading a version of photoshop. Ever. So I'm not sure why this should matter.
I do not use a Mac. A droplet on Windows will start Photoshop if Photoshop is nor running. I would think the same would be true on a Mac. If you Installed CC 2018 Adobe will default to remove Previous version of Photoshop. When You droplet tries to start CC 2017 it will not exist unless you re-install CC 2017.