I went to look at something in System Preferences earlier, and I saw that the "Sharing" pane was missing. Was this a change with Mavericks (I don't go into the preferences very often), or is it a software bug? I have also checked to make sure that it is not hidden, and it will not show up with a search of the preferences. EDIT: After thinking about the problem for a while, I thought of going back in a Time Machine backup to get the SharingPref.prefPane file. After searching through several months of backups, I found the file and restored it. It must have gotten deleted during the latest update to Mavericks.