Some users have reported that after setting up disks to be kept awake, Amphetamine may freeze.
Reason: Filepath to disk contains unexpected string "localhost"
You can confirm this issue affects you by opening Console.app from /Applications/Utilities and searching the system.log for the text "URL string: file://localhost"
Fix: Update to Amphetamine 1.5.5
Amphetamine 1.5.5 is currently in beta. You may download it here:
Amphetamine 1.5.5 will be available in the Mac App Store soon.