Tested, campaign is bugged as hell!!!.
Starting map l4d_cc3, we were 3 players and 1 bot, 2 players spawned stucked and the bot outside of the saferoom, bot don´t follow, is freezed, common zombies and specials don´t spawn.
I restarted this map 2-3 times, same problems everytime, and errors about FLOWS and Directors can´t populate world or something like that, and some missing textures in a building.
Previous version of this campaign was free of problems.