I’ve discovered an interesting, and reproducible, bug with MODx 2.7.3 where the Manager will refuse to load if you are running multiple sites from the same MODx install, and you log into the Manager from a site that isn’t the main site.
Say you’re running site1 dot com and site2 dot com on the same MODx install, and you log in to the Manager by visiting site2 dot com/manager instead of site1 dot com/manager. The manager won’t load (the left-hand listing of resources and elements is blank).
Worse, from that point on, you can never again log into the Manager on that MODx install, from any URL, until you rerun Setup and do an upgrade install.
I’ve encountered this problem on Mac and Windows browsers (Chrome, Safari, Firefox) and it’s 100% reproducible. Log into the manager from site2 dot com/manager, boom, manager is forever broken until you rerun setup.