I was running Flooded Depths Dungeon (Lv. 59) in an attempt to complete and obtain the aspect. While playing solo on my rogue I was prepared to encounter the first objective boss (Slay the Plague Ship Rower) and I ran into a mist wall. Thinking it weird but knowing you can just click on them usually, I attempted to do so and found that I was unable to continue the dungeon. Though my mouse hovering over the wall said “Join Fight in Progress” when I tried to click it I received, “You cannot join a Boss encounter right now.” message. All this happened while playing solo in WT3.
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Same here, solo in Flooded Depths but WT4 
Same here, restarting the game multiple time hasn’t changed anything. Maybe fourth time’s the charm… Man I’m sure this beta level experience really justifies their high salaries…