This tutorial is for those who have installed Extended Preferences or Advanced Preferences, got the "Main script execution failed!" dialogue, and found out that their Preferences.app (Settings) has either stopped working (just shows the background and freezes) or completely disappeared, and all attempts to uninstall and reinstall fail to bring back your beloved Settings application. First, use your favorite program to access your iPod's filesystem. *Make sure you have write privileges!* Now, navigate to the "/var/root/Library/Preferences" directory. There should be a file in this folder called "Preferences.app.bak". This is the backup created when the Extended/Advanced Preferences application was installed. Copy this file and paste it into the "/var/Applications" directory. Rename it to "Preferences.app" (just delete the .bak part). *If a warning comes up informing you that there is already a file named "Preferences.app" in this directory, select "overwrite all" or simply delete the other file.* Chmod "Preferences.app" to 755. Start up your iPod and restart springboard if needed. Now, you should have either: a working Settings application, or a Settings application that freezes with only the background showing. If you have the latter, go back into your preferred filesystem access program. Navigate back to your newly restored "Preferences.app" in the Applications folder. Instead of simply chmodding the ".app" file itself, navigate into the ".app" file, and manually chmod every file in there to 755. Start up your iPod again and restart springboard if needed. You now have a fully functional Settings application. Thanks to this whole forum for creating a kickass community!