Wordpress-Version ist 5.0.3, WPShopGermany 4.0.11, PHP 7.1. Provider ist Strato.
(Und ich habe die starke Vermutung, dass Strato mal wieder mit seinen temporären Pfaden für Ärger sorgt - ein Blick ins Error-Log zeigt mir:
Allgemeiner Fehler: Zugriffsfehler!
#0 wpsg\Exceptionhandler::exception(Exception Object ([*message] => Zugriffsfehler!,[Exceptionstring] => Exception: Zugriffsfehler! in /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/controller/wpsg_SystemController.class.php:635
Stack trace:
#0 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/views/admin/ueber.phtml(98): wpsg_SystemController->getTemplatefile('/mnt/web408/b0/...')
#1 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/controller/wpsg_SystemController.class.php(670): include('/mnt/web408/b0/...')
#2 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/views/admin/index.phtml(48): wpsg_SystemController->render('/mnt/web408/b0/...')
#3 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/controller/wpsg_SystemController.class.php(670): include('/mnt/web408/b0/...')
#4 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/controller/wpsg_AdminController.class.php(1918): wpsg_SystemController->render('/mnt/web408/b0/...')
#5 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/controller/wpsg_AdminController.class.php(42): wpsg_AdminController->ueberAction()
#6 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/lib/filter_functions.inc.php(14): wpsg_AdminController->dispatch()
#7 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-includes/class-wp-hook.php(286): wpsg_dispatch('')
#8 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array)
#9 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#10 /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-admin/admin.php(224): do_action('toplevel_page_w...')
#11 {main},[*code] => 0,[*file] => /mnt/web408/b0/79/519379/htdocs/untergeekde/wp-content/plugins/wpshopgermany-free/controller/wpsg_SystemController.class.php,[*line] => 635,[E....