id summary reporter owner description type status priority milestone component version severity resolution keywords cc focuses 30786 WP Network Subdomains Vanish nicheroot "upgraded: 4.0.1 to 4.1R3 Setup: wp network with 4 Subdomains (sub.nicheroot.com, etc.) All Subdomains in maintenance mode After upgrade: Nicheroot.com main domain works properly with settings and all Subs.nicheroot.com --> 1 works fine wi /wp-admin and browser viewing All others no /wp-admin access but some could view maintenance mode on browser with direct web address (sub.domain.com, etc.) ""Internal server error"" message on browser Some missing index.php, etc in host's control panel under ""cache --> page enhancements"" folder Essentially, I just had to delete and re-add sites taking posts from MySQL database directly to at least get back to where I was...kinda So, 4.1 appears, to me, to break WP Networks" defect (bug) closed normal Networks and Sites 4.1 normal worksforme multisite