Connection to the Laanx server (the game server) seems to be laggy currently and a lot of network packages get lost. If too many packages are lost, the server thinks that you are disconnected and sends you that "You should not see this" message before dropping the connection. There is very little you or us can do about it.
People also report that when they leave the game window (activate some other windows) or minimize it, they get disconnected from the server with the same message. This is currently investigated, but we haven't found a reason for it. You can help us testing it and trying to find out, when exactly are you getting that error message. If there is something that can be reproduced, tell us about it.
