I have a user who receives "Your submission could not be processed because a security token was missing." She also received "Failure to receive playback ID."
I'm not sure if this is just her or not, because I haven't played since upgrading (still setting up decks and CPUs and such) but just thought I'd mention this.
My board is running 4.0.6, freshly upgraded today.
http://www.utahraves.com/showthread....527#post405527