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Could you please delete com.cocoatech.pathfinder-setapp.plist from ~Library/Preferences (from Finder pick go -> holding ⌥ Library), then reproduce and send us a sample (a snapshot) of Path Finder process in a separate file? This will enable us to analyze what happens with the application. Here's how to get it:
Open Path Finder and reproduce the problem. If the problem is dynamic (e.g. unexpected action result), please try reproducing it during the sample collection.
Open Activity Monitor from the /Applications/Utilities folder.
Select Path Finder in the process list. To help making a selection, type "Path Finder" in the Filter field.
Click the Sample Process button in the toolbar - this will open a new window entitled "Sample of Path Finder" and a sample of the process is collected.
Click Save and save the sample file.
Close (Command-W) the Sample window opened in step 2.
I'm having the same issue. 15" MacBook Pro Retina running 10.15.1 using PathFinder 9.0.4 (2021), Setapp 2.4.1. I've uninstalled Pathfinder and even scoured my hard drive to make sure no remnants remain (e.g. preferences, launch demons, etc.). After reinstalling, still have the problem.