Recently I've been trying to resolve a conflict between the Warcraft Classic and Star2 Coop mods. The two don't explicitly say they are incompatible like the Campaign and Multi mods do, however enabling both at once causes all the sounds to disappear in whichever of the two mods is lower on the list due to invalid object identification errors. It appears to be something in the Actor data that's causing this, but beyond that I'm at a loss. If this can't be resolved, then this needs to be reported to Blizzard as a bug and the mods need to be marked as incompatible with each other.