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This release is just a temporary fix for offset problems. Addthis.com has made changes to their js/css files and these changes are causing problems with offset settings. Settins are still available in admin, but are not active in production.
If you are currently using offset settings and do not have any problems with your theme do not update to version 2.5. This is a recommended upgrade for users who are experiencing problems like these: http://drupal.org/node/313655