I was seeing the Skeleton King on both my Windows and Linux servers yesterday both before and after the update, but he wasn't spawning Wednesday night. Not sure if it's controlled by the identity system used for quickplay since the servers were being wonky the night before.
Anyway, I've noticed that the Skeleton animations have been broken since yesterday's update on my servers.
Having said that, Halloween gifts are working on my Linux eventmix QuickPlay server, but not on my Windows "registered but cvar Quickplay disquialified" server.
