If you have a WordPress site here, beware of the “Clean It Up” plugin, a plugin designed primarily to clean up the MySQL database.

     One of it’s functions is to delete unattached files.  Unfortunately, it decided all of my header files were “unattached files” and deleted them.  This may be a problem specific to the twentyeleven theme, or my modified version thereof, I don’t know as that’s the only theme I am using here.