i was having the same issues and figured out how to fix it!
open the folder
/Library/Application Support/
find the Subsonic folder and rename it Subsonic_old
reinstall Subsonic.
launch Subsonic.
exit Subsonic.
copy the contents of
/Library/Application Support/Subsonic_old/db
to
/Library/Application Support/Subsonic/db
copy the file 'subsonic.properties' from
/Library/Application Support/Subsonic_old/
to
/Library/Application Support/Subsonic/
launch Subsonic!
that seems to do the trick.
