I have all the DLC and all the DLC is installed. I played last night until 2am. This morning I see update 4.0.1 is available, and Steam applies it.
I play for an hour, then run an errand. 45 minutes later I go to fire up my game and it says I'm missing LAXH and LAXI.
What happened? Where did my DLC go in the last 45 minutes?