How do duplicate:
Go to the MainWP > Posts page:
Search for Posts on on some child site
(here you will get good table)
Next go some other page
Return to the MainWP > Posts > Manage page
(here you will be able to see the issue)
This issue is present on following pages: MainWP Posts, MainWP Pages, MainWP Themes, MainWP Plugins, MainWP Users.
Caught this error in the Error Log:
PHP Warning: Invalid argument supplied for foreach() in /home/mainwpdev/public_html/beta/wp-content/plugins/mainwp/class/MainWPSystem.class.php on line 560