there is 4 missioins to do heroic encounters totalling 400 encounters but they dont start so y have them if i am dumb enough to try this solo then you should be dumb enough to allow it or remove theese missions and stop waisting our time and money as i was also dumb enough to buy wands to ensure drop rate
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I'm going to guess that you would like to start the encounter instead of instance hopping to an already started one.
http://www.arcgames.com/en/forums/neverwinter#/discussion/comment/12908415
Known bug, tied to merchants leaving the area. You could try to fix it, but there are also some pretty good suggestions throughout that thread.