Dear Tech support,
There is one strange bug I had yesterday and I can`t find this back on this forum.
On the Steam forum there is another topic about this:
http://forums.steampowered.com/forums/showthread.php?t=1891281
It happened to me when I joined a coop story mode server. (8 people vs bots)
When I checked the scoreboard, I could see only the human team.
I could not see the enemy walking, one or two other people on the server had the same problem.
After disconnecting and reconnecting to the server I could see the bots again.
On the scoreboard the bots scores where back as well.
After switching map I had the same problem again.
The weird thing was, one the human players had switched side.
I could see him running around, the bots and bot score where invisible again, he was the only one visible on the other team score.
Cheers for looking into it. 