Hi,
Researching further, this issue only happens on Chrome. On IE e FF it works fine. On Chrome, the following errors are displayed in the developer console:
Failed to decode downloaded font: xxxxx/wp-includes/js/tinymce/skins/lightgray/fonts/tinymce.woff
Failed to decode downloaded font: xxxxx/wp-includes/js/tinymce/skins/lightgray/fonts/tinymce.ttf
We run nginx and we’ve already added the proper MIME types…
Thanks