it doesn’t seems have anything to do with the permissions, that are set up correctly on windows server and MySQL,( indeed it’s about a month that my SuiteCRM is on production with many studio customizations done). I tried a ‘restore default’ and now it looks like it works again. I noted that there, is present a sort of ‘ghost label’ related to a field that I have created and then deleted some days ago, and I can’t get rid of it. If I move it under hidden elements, then the same problem occurs again. This label is present in many files listviewsdefs.php_xxx in history/modules/Contacts/metadata