I am having the same problem that magnata is having (One of them)
Firstly, the boss music does not play. (Christian brutal sniper and gentle spy)
Second: Backstabs kill the boss instantly.
I have done a fresh reinstall of sourcemod, metamod, and freakfortress2
Not sure about the backstab (Never tested today), but the music is 100% not working no matter what I do. I shall list plugins when I get home. (2

5 PM EST)