Delete the preference file for Geek Perfect (close Geek Perfect first). In Finder, open the Go menu, and select Go To Folder. Try entering the following location (making sure to change the username to yours):

 

/Users/Username/Library/Preferences

 

Once in the Preferences folder, find and delete the following file:

 

com.bitperfectsound.GeekPerfect.plist

 

Open Geek Perfect and reset all options, enable DSD, and specify that the Geek Out is DSD capable.