On one particular custom mission, the sounds for weapons firing from both other players and AI would stop and I could only hear my self firing.
There were three of us playing and all three of us had the issue on this one particular mission. We resorted to saying, "Pew Pew" just to tell the others that we were shooting.
It was in the updated version of Insurgency
We noticed this when playing last night, it happened after one of two things.
1:changing any gear
2:Dying
In both instances we could correct it by going to a crate and picking up and NLAW and dropping it again.
We also noted that weapons/attachments viewed on other players would change, for example.
my friend Dave goes into a crate, takes an EBR and no one can hear Dave shoot but him. Other players also saw Dave's original weapon NOT the EBR. Dave picks up and NLAW and suddenly everything updates and we see his EBR etc and we can hear him again.
We are very sorry, we do not guarantee that user generated content such as mods, scripts, maps etc. will work all time during developement of the game. It is up to users themself to make sure their work is 100% compatible with current version of the game.
We thank you for reporting this issue, but try contacting author of this content to fix it.