The Vrtualmin verion is 3.90 Pro and running on RHEL6 64 bits. I have had a lot of probem of installing scripts as root or as reseller account. Today, it complaints "Failed to extract source :Uncompression"failed : when installing WordPress. Yesterday it complainted about "can't copy the /php/php.ini" something like that when applying web server configuration.
If I create a new virtual server with default template and default plan, sometime the problem went away. If I changed default template to the existing virtual server, the problem occurs again. WHen this problem occurs, the administrator can't scp and ftp to the server. THe network connection is closed immediately.