Just an FYI.
My East disc burned and updated fine. haven't checked to make sure all the features still work. re: some problems some people have reported. I'll be checking tomorrow. but the maps load and default wallpaper is different now. so far so good.
I burned it on verbatim DL, pioneer 112D burner, using the mentioned layerbreak (I think this might be important) also, my burner auto-sets the booktype to DVD-ROM (not sure if this is important or not).
so those having problems. might be either layer break, booktype and/or the brand of media.
Thanks again.