No longer work after latest update

If you open the JS console, do you see any errors?. Please see here for instructions on how to do this: https://updraftplus.com/faqs/how-do-i-open-my-browsers-developer-tools/

Can you also ask your hosts for you php error logs

There are errors in the console.

No php errors.

POST /wp-admin/admin-ajax.php?_fs_blog_admin=true 400

@vupdraft I found the issue, it was caused by W3 Total Cache Object Cache

Clearing the object cache fix the issue.

Thank you.