Classic WP editor

Hi there.

I think that with the latest wordpress update I can no longer use the traditional editor ...

I do not use gutenberg and that is why I have disabled it, but the problem I have is when I use the traditional editor I cannot load images in the posts or pages and some buttons such as "draft" or "schedule publication" do not work correctly.

In the case of images, when I try to install them from the "add media" button, it allows me to select it from the media library but it doesn't place it ... it just doesn't do anything, the image doesn't appear in the edit ...

In the case of the "schedule publication" button, when I want to change a date, when I save the changes, it gives me page error 403

I wanted to know if this could be due to some incompatibility with GP.

I have disabled the gutenber editor in 3 different ways: with the "no gutenberg" plugin, with the "classic editor" plugin and also with a code snippet. With the 3 forms, the loading of images and the buttons that I mention give me an error.

The support of my gosting service tells me that there may be some incompatibility with the theme.

Thank you in advance.