Hi!
I doubt this is an instance-specific issue, since it has happened to me also in missions, but maybe it helps identify the common bug, or whatever.
The thing is after objective 7 of the instance is complete, it does not progress to objective 8 (a ring over Theoden does not appear, for the character to speak to him). I have tried jumping around, emoting, everything... but to no avail. Half an hour here and nothing happens, and I don't want to cancel as I would have to start all over again. I tried sending a ticket, but guess there is no in-game support now, at least on weekends.
I could not find on the forums or elsewhere a trick to trigger progression. Any ideas?
If not, leaving instance it is... :-(