When ANY plugin is deactivated, the youtuber options will get deleted.
When ANY plugin is activated, the youtuber options will get installed again(with the default settings. ).
This is due to these to actions:
add_action('activate_plugin', 'youtuber_install'); add_action('deactivate_plugin', 'youtuber_uninstall' );
Also the second action that calls the 'youtuber_uninstall' function will fail due to the function actually being called 'wp_youtuber_uninstall'. You will get an php error each time you deactivate a plugin.