all pages on Multisite show just a blank page

For about 24 hours none of the Multisite Network Sites are displayed (no error, just blank). Hosting company, Hostgator said servers were running well, that the problem seemed a script that was allowing display. also tested loading a php file and it works fine. http://prolegalnet.com/phpinfo.php

the affected site where the multisite is, is http://pronetwork.us/
http://pronetwork.us/network/

Cannot go through the admin cuz unreacheable. Think may be the theme (DIVI) but couldn't see anything. Other option is a security hole in the application, which we are already checking.

CANNOT GRANT SUPPORT Dashboard Access because not able to log-in to WP http://pronetwork.us/network/wp-login.php

Thanks!!