Haven't tried a third time, but the last two times I've tried to enter Tham Gilliath (it's in Meluinen), it acts as if you're falling into water (there is no water in the building) and then yanks you back, drops you down, etc. like a yo-yo. You can't leave the building or talk to the guy in the building. You can /unstuck or /stuck but that only works once/hour. Go back in. Same thing.
You can CLOSE the game unceremoniously and then it'll behave.
You can CLOSE the game unceremoniously and then it'll behave.