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.

the affected site where the multisite is, is

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