Exalted Plains: Solas' quest bug

Hello!

I would like to finish this quest, but there appears to be a bug. 

I got the quest from Solas and entered the Exalted Plains. I first did a few quests for the Dalish and entered the area of Solas' quest from the west. Solas reacted to what he saw, but nothing happened.  I can see the pillars and the object in the middle, but I cannot interact with anything in the area of the quest and the quest maker is gone from the map. It is still in the journal though, but when I click it, it doesn't show me where to go any longer. 

I had some repeating dialogue that I think might be from the quest when I moved towards the fade rift to the east of Solas' quest, but nothing changed regarding the quest itself. It looped a few times ( around 4-5 times, even at unrelated places like further south). Reloading and fast travelling did nothing. 

Is the quest broken? How can it be solved?