So Live Journal was complaining that the underlying style mechanism (S1) I was using was going to go away, and I should switch to the new mechanism (S2). On the down side I lost the really clean look of my old style. On the up side I have a new programming language to play with. It appears that S2 is built on top of a domain specific language created explicitly for handling the style and themes of Live Journal.
I haven't really looked into it a whole lot, but expect my Live Journal theme to change as I learn more.