While running two clients with a mule, I've noticed the problem with the cash shop ring "Cross Hearts" It occurs that the client that is not active (say, a mule in the background) disconnects whenever the other character moves out of range, whether by cc, map change, or just enough for the heart particle to disappear (later occurs more rare). It isn't a guarantee that this happens with every occasion, but it occurs often enough that it makes it troubling to run a mule with that cash shop item. Whether this occurs with other crush rings, I do not know.