I'm constantly getting desyncs right at game start since a few days. Apparently they have no effect though, but I am not entirely sure and it is annoying anyway...
For some reason there was no game.log in my logs folder... so here is the replay.log and the forever.log:
replay.log: http://pastebin.com/a2fhmY62
forever.log: http://pastebin.com/xy1Eedab
In ranked games the desync does not affact the ratings. They are given anyway. The replay.log here is of the first game I played where an issue came up that to me looked like desnyc related. I played even over an hour long games with the desync message at game start without any trouble later in the game.