All Pages and Posts on WP 4.4.2 Multisite Network Began 404ing or Redirecting

Hello

Overnight, almost all pages and posts on all site on a WP 4.4.2 network began 404ing or redirecting to the home page of each site, so it seems to be a centralized issue.

The page and post urls that are 404ing are all valid and were working before this issue.

Two developers have been unable to sort it so far. Perhaps a WMPUDEV genius can. :slight_smile:

I granted support access through the WMPUDEV dashboard.

Wordfence security scan reports no issue, but it is suspicious that it occured overnight and we had granted a theme developer access to fix a theme issue.

Any assistance would be appreciated. ASAP.

Thanks,

Phil D