Log in failed in ojs 3.4

Good morning and thank you for your time. yesterday I upgraded a installation to 3.4.
I saw that something has changed in the recaptha management in the config.inc.php file. however yesterday I managed to enter the administrative part, while, after logging out, when it comes to logging in again I get this message.

You must complete the validation check used to prevent spam submissions.

How come? thank you so much as always to you all