Chris, sorry mate, went out straight after entering clue so missed your post.
AB is correct, 'Perks' is the anagrind - as in Chambers - 'to dress up'
anag of 'are lost' inside MM (2000) and 'upheaval' is the Def as in 'Chaos and confusion' - I was going for a spin on the worry caused with the big change over in the year 2000 and 'Perks' to be misread as the shorter form of 'Perquisites'