mine was the MASK unit, after update from orig grey to latest software still grey
some hidden sat nav software was updated and the DAB menu changed ever so slightly, I would expect like most updates lots of silly errors you may not have noticed go etc. Never went back to check where my nav lost the plot but as u see here a fair bit of the behind scenes stuff got updated
http://www.e90post.com/forums/showthread.php?t=932965