Weird anomaly I get on a particular WordPress installation: when user accounts are set to Editor, they get a blank screen upon successfully logging in. Other role settings like Admin or Author work fine. Other WordPress installations on the same server with similar themes and plugins don't have this issue, which has remained the same through multiple WP upgrades. Adding error reporting to wp_config produces nothing. The only way so far to fix it is to change the role to either Admin or Author. Any ideas?