Hi!
When I'm playing the campaign online (maps added by admin commands) it often happens that the game of the people participating crashes.
While I can still play the mission objectives all other players leave at the same time, their game is crashing to desktop without any error message.
Do you have any idea how to fix that or is it impossible to play the campaign online without this bug?

~Locutus

The campaign isn't really meant to be played online - it's doubtless going to have some bugs in it. I think some time ago Zerted started editing the campaign scripts to be multiplayer-friendly. I'm not sure how far he got.

Try different missions. Some are just not fully MP-compatible.

I did almost finish one. I was going to make them all MP friendly, but attempting to keep it balanced while people joined and left the server was too much of a pain.