I have noticed that with Woocommerce website's that when the customer logs in the dark toolbar still appears at the top of the page even with the hide admin toolbar plugin activated. 

After doing research it seems to be a conflict with the maintenance plugin. You need to deactivate the maintenance plugin and also add this code to the Theme's Functions.php file.




add_action('after_setup_theme', 'remove_admin_bar');
function remove_admin_bar() {
if (!current_user_can('administrator') && !is_admin()) {
  show_admin_bar(false);
}
}