After updating to Neos 5.1 (and recently 5.2 too) I think I found a bug in the backend UI. When a user session times out and the UI prompts the backend user to login again, it is not possible to login. The UI says that the username or password is incorrect (even though it is definitely correct).
This is on a fresh installation of Neos 5.1 and update to 5.2, the issue was present in both versions. I don’t have this issue in a website that is running 4.3 currently.
The AJAX request to “/neos/login.json” returns a 500 error with Neos-PHP-Error “Call to undefined method Neos\Flow\Mvc\View\JsonView::setFusionPathPattern()”.
This should be easily reproducible on a new instance. Login into the backend, run “flow flow:session:destroyAll” and try to login again (in the relog-dialog that the UI shows when a user times out). Is this maybe a bug related to the new AuthenticationProvider changes in the recent Neos versions?