This has been driving me mad on this server. When you cast something (or mount), and hold the right mouse button to turn the camera, sometimes you get the "Interrupted" message and the cast is cancelled. I don't think I need to say how irritating this is to someone who's used to turning the camera all the time when casting.
This happened to me once in an instance group and the party members said that my character appears to do the 'falling down' animation in their client when I turn and the cast is cancelled.
Is this happening to anyone else? Help?