While doing the quest "Traitor" in the Alderran planet story arc, we encountered a bug that prevented progress; we picked up the Thermite explosives, but could not place them on the pillars. Resetting the phase did not work. To try and get the quest working, we abandoned it thinking that starting it again might work... but now we cannot find anywhere to pick the quest back up. The NPC who started it is not doing so, there's nothing at the spaceport where the story arc began, and killing the NPCs that were needed for the previous quest has no effect. How do we resume the story quest after abandoning it? Edit to add: We already tried the obvious steps. The game files are intact, we changed server channels, we re-zoned, we re-logged.