Same issue. Acts as if it is actually running, ie populates into the task bar, and when the mouse hovers over it it shows the launcher as if it is indeed working. i can click on it, but it will not bring it up sometimes it feels like it is trying to open on a different screen.
I am trying to costume an Ashamdai- Mixed - Hard difficulty 1 (#9) shocktrooper to look like the NPC, but whenever I change it the actual shocktrooper costume shifts to another in the encounter group. Is there something that I need to do in order to only change the single mob?