Coming from the Treyarch forums…
A quick heads-up, we’ve pushed out a hotfix today (which will download automatically when you start the game) which introduces a couple of changes:
1] Added in collision to prevent MP map exploits.
2] The Team Tactical playlist now allows up to 10 players.
Also, a Double-XP weekend is coming for the holidays (Dec. 24th – 27th), so be ready to rank-up! – JD, Treyarch | Community Manager