Found a couple of bugs with the De Mevius conversation: Sero/Serafina's pronoun tag appears as code instead of text (this seems to happen in several cases, actually), and even if you've already talked to the De Mevius', you need to repeat the conversation to progress unless it's the last group you talk to.
And some more: There are *several* errors that pop up with talking about the customers and the bar, and they just loop between each other. Can't progress past that point.