FIXED: Removing the mod(@super_flash) , and verifying the gamecache after that solved the problem

-------------------------------------------------------------------------

When a gun is fired by a friendly player controlled unit, neither the sound of the gun firing nor the animation ( recoil, muzzleflash, shell ejection) can be heard or seen. Only the impacts of the bullets are audible. The Model of the gun itself is visible. All sounds and animations are working from my perspective when fired by myself.

Switching the rate of fire from single to automatic solves the issue temporarily on aussaultrifles and submachineguns. Weapons like pistols and launchers are affected and cannot be heard since the dont have an auto fire mode.

Though me and my clan use the same set of mods http://play.withsix.com/Arma-3/collections/wa4ucEGankOG4T5HwCXD0Q/Zeus-Extended/content , all updated and checked of course, the issue seems to affect people at random. The sound issue extends to standard arma weapons such as the MX or the P07 or PCML,
and tests with and without sound and weapon mods came up with the same result.