It seems that the contents of the MCP Chunks has changed. I only noticed because I was doing some pretty sloppy data storage/manip in my current project that ultimately broke things when Blizzard made this change (a few months back from what I can tell). I wasn't motivated enough at the time to figure out what Blizzard changed to break my stuff...but as soon as I started looking at the packet logs, I noticed that SID_LOGONREALMEX and MCP_STARTUP looked totally different. Still the same length but the chunks look like maybe plaintext hashes of some sort?
