Manilius' Lost Son, the step titled Listen to Caepio; when interacting with Caepio and you click on the linked text "cache of jewelry" it brings up dialogue from Ahala about Caepio's lost dagger. Her linked text gives the nil is not online error common to other bad links.

Closing her dialogue window and clicking the cache of jewelry text again in Caepio's dialogue continues to the next step correctly.

I also have the Caepio's Troubles II quest active (dealing with the lost dagger), so there appears to be a conflict between the two.

I may also have somehow gotten the quests out of sequence somehow or they might have changed. I had the Caepio's Troubles from a good while ago.