I'm working through gold side, finished Imperial City, moved to Neutropolis, turned XP back on, advanced to level 16, trained, then completed the IVy story arc. At completion, when I should have been given the introduction window to Praetor Tilman, I was instead given the Praetor Tilman window that basically says I out-leveled the contact. No further dialog chance was in the window. As I've understood from reading other's comments, levels 16 to 20 should be active for Neutropolis. As I pondered what to do next, I opened Contacts list, discovered Praetor Tilman in the Active tab, and was able to call to start her arc.
So, at least for my character, there appears to be a problem displaying the right introduction window for Praetor Tilman from the IVy story arc completion. Might be a bug affecting others as well.