Main quest bug - Influencing Inquisitors

Time: May 30, 2015. 9:37AM EST
Frequency:Always?
World name: Gilgamesh
Character name: Lacrymosa Mortalis
NPC name:Joellaut
Monster name: N/A
Class/Level: DRG/40
Party or solo: Solo
In-game time: 2:38PM server time
Area and coordinates: Coerthas Central Highland > Whitebrim > Whitebrim Front
Steps:
1. Accepted main story quest Influencing Inquisitors
2. Talked to all quest marked NPCs on the map (3 of them)
3. Couldn't interact with the 4th NPC, who engages me in generic conversation instead of quest related dialogue.
4. Have tried logging in and out.
5. Option to abandon the quest to try again not present in this case

Connection Specs
- Type of internet connection/provider: Cable/Rogers
- Modem maker/model number: