I haven't paid much attention to the MP side of this release and I should note that it uses some operations added when Viking Conquest released and if I'm not mistaken Taleworlds didn't update their server hosting executable to take them into account so if it's the case you'll need to replace the Warband_dedicated.exe (something like that) with the VC one. There might be other bugs, this hasn't been tested yet, so please report.