It's on radar now. Thanks for reporting.. We need to dive deep in what is the root cause. The logging says:

[2024-09-12T20:42:54.414611+02:00] request.ERROR: Uncaught PHP Exception Symfony\Component\HttpKernel\Exception\BadRequestHttpException: "Invalid CSRF token" at AbstractController.php line 39 {"exception":"[object] (Symfony\\Component\\HttpKernel\\Exception\\BadRequestHttpException(code: 0): Invalid CSRF token at /var/www/kbin.melroy.org/html/src/Controller/AbstractController.php:39)
[stacktrace]
#0 /var/www/kbin.melroy.org/html/src/Controller/FavouriteController.php(24): App\\Controller\\AbstractController->validateCsrf()
#1 /var/www/kbin.melroy.org/html/vendor/symfony/http-kernel/HttpKernel.php(183): App\\Controller\\FavouriteController->__invoke()
#2 /var/www/kbin.melroy.org/html/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\\Component\\HttpKernel\\HttpKernel->handleRaw()
#3 /var/www/kbin.melroy.org/html/vendor/symfony/http-kernel/Kernel.php(182): Symfony\\Component\\HttpKernel\\HttpKernel->handle()
#4 /var/www/kbin.melroy.org/html/vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php(35): Symfony\\Component\\HttpKernel\\Kernel->handle()
#5 /var/www/kbin.melroy.org/html/vendor/autoload_runtime.php(29): Symfony\\Component\\Runtime\\Runner\\Symfony\\HttpKernelRunner->run()
#6 /var/www/kbin.melroy.org/html/public/index.php(7): require_once('...')
#7 {main}
"} []

Yes, so the magazine is: @[email protected], which is: https://gehirneimer.de/m/mbinmeta. But I read all Mbin related magazines.

That doesn't fix it every time for me, alas.