last update problem mailing list

hello, today i updated the NS PRO, now if i enter to create a new mailing list or i open any other mailing list, the Template Code * keep flashing like of and on and not able to do any modification. 

Hello Georges and thank you for posting. 

Can you please share a screenshot or a short video?

Which version of Joomla / PHP are you on?

hello, 
PHP 8.4.16 and last version of joomla.
 

Okay, the video shows that you are trying to edit an email template and the editor constantly refreshes.
Do you have any editor plugins active?
For example custom buttons or integrations?

If you want to provide temporary access to your backend, you can send credentials at me@mavxr.com.
The Javascript console will almost certainly tell us the origin of the problem.

Thanks again.

it seems a problem of browser, i always used firefox, now not working,  i changed to microsoft edge is working.