8 people downloaded the upgrader for 1.0.9.1 and it was missing the deletion of the following files. If you upgraded to 1.0.9.1 using that tool, please manually remove these files.
I have since updated the upgrader to correct the issue.
'/admin/includes/functions/autoloader.php',
'/admin/includes/functions/compatibility.php',
'/admin/includes/functions/database.php',
'/admin/includes/functions/general.php',
'/admin/includes/functions/html_output.php',
'/admin/includes/functions/languages.php',
'/admin/includes/functions/password_funcs.php',
'/admin/includes/functions/sessions.php',
'/admin/includes/functions/validations.php',
'/includes/functions/autoloader.php',
'/includes/functions/database.php',
'/includes/functions/general.php',
'/includes/functions/href_link.php',
'/includes/functions/html_output.php',
'/includes/functions/image.php',
'/includes/functions/password_funcs.php',
'/includes/functions/sessions.php',
'/includes/functions/validations.php',
'/includes/system/versioned/1.0.7.9/osc_template.php',
