I've completed the dilemma quest, and since then he's shown up twice without selling anything, and without actually *being* there. Like, I can't find him. He's also shown up to sell me a couple of things, so it's kind of a confusing situation.
When he shows up without selling, it's almost sort of like he wants to give me the quest, because here's there for 7 or 8 days, but the quest symbol (the scroll) isn't next to him, I've already completed his dilemma quest, AND he's nowhere to be found.
I'll see if I have a save file for him showing up without any goods.
ETA: I don't have a save file at the right place, but here's a screenshot of the message I got the second time he showed up not selling anything.
As you can see, it doesn't even say Azzuro's name.
When he shows up with goods I can purchase from him wherever I am, so that's not a problem I'm having.