Sometimes the alias that points to Ivory's Library (your Ivory Items folder) can become corrupted or broken. To restore it, simply go to the Ivory Items alias located in OS X: /Users/{Home}/Library/Preferences/Ivory Preferences/

Click once on the Ivory Items alias, press Cmd-I for Get Info, click the Select New Original button, and select the Ivory Items folder at the proper location of the real Ivory Items folder. If no alias is present in this location for your Ivory Items folder, then one must be created. Go to your real Ivory Items folder and select 'Make Alias' from the file menu (or Cmd-L). Place this alias in your Ivory Preferences folder and make sure that once there, the alias is called "Ivory Items" without any additional characters or spaces