Can't render thumbs

I’m struggeling move from V2 to V3. But step by step, the panel could not render thumbs. Even on a complete new blank installation (via composer) without nothing rewritten, I get blank images (which are fine at V2) and a empty alert, if I press the button to delete it (which is not possible).

Does the front-end work? What is your local environment?

Front-end works (With the word „Home“ / clean install), Environment is Mac OS, gdlib is installed via brew, server is started using php -S localhost:8000.

If you want to use the built-in server, you have to start up the server with Kirby’s router:

php -S localhost:8000 kirby/router.php

Ahhh, this works. Thanks!