When i try to open 2 wow clients at same time then the first one i open works fine. Opening 2nd wow client doesn't bring up log-in screen, i just hear wow music on background. If i close the client which i opened first then the 2nd client works fine. Also it doesn't show up on bottom bar.
Edit: I managed to get 2 clients running while being in windowed mode, when changed back to full screen, only 1 client worked and 2nd didnt.