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This forum will help us track the problems you may encounter in the campaign. To be the most efficient, please read these few guidelines:
Specify which version of the game you're playing on, Left 4 Dead 1 or Left 4 Dead 2.
Specify which version of the campaign you're using, the info is in the README.txt provided with the download.
Be as precise as possible because the levels are big and detailled.
Also, we'll close the topics when the corresponding bugs will have been fixed in our development version. That means it will be fixed on our side, but only on the next release for you.
Thank you for your understanding!