I have PHP logging to syslog, nothing relevant to RoundCube there. I've seen one other person who had this problem and solved it by deleting the existing database and re-starting from scratch but the installer does
not see anything wrong with the database. I even turned display errors on in PHP and the only error printed is "Deprecated: Directive 'track_errors' is deprecated in Unknown on line 0", Interestingly with display_error = On NOTHING functions, won't show me any of my mail.