I have had the Vendetta Updater Utility update my computer with a 121377KB update while saying that I have the current version and having no other effects. It seems to only happen if I start the game multiple times in a short period of time. I think I saw something about this earlier, but the devs said that they could not figure out what was happening becuase they were unable to replicate it. I'd suggest that they try logging a computer in a bunch of times in a row till it happens.

EDIT: I am running Mac OS 10.4.1

Don't forget to mention which OS you're running, since they need to make separate update files for Linux, Mac, and Windows.