*yawns* chill. every mmo in the history of mmos has had xpac day bugs in one form of another. It happens. They have no way of determining the extent of issues until the xpac hits live servers. it's 1 thing to test on a controlled dev server. it's something entirely different to put it onto a live server with thousands upon thousands of players hammering the content all at once. They will fix it. They just have to figure out how to first. It's not like flipping a light switch. It's literally going through millions and billions of lines of coding 1 at a time and tracing network disconnects line by line. it takes time.