dying...
this sounds like you have a permission issue. \"Read only\" is a basic access permission. Are you sharing this computer with anyone else? Or you may have installed this program under your \"Administrator\" login name and you are simply logging in another account?
command + I the planeshift folder. Look under ownership & permissions.
Are you the owner? If you are, then just unlock the folder, give yourself access and relock the folder.
If you are not, the then owner needs to give you access rights.
If you need help doing this there\'s plenty to read about this on the Internet.