Off topic, but that fx looks familiar 

Delete your mod in appdata. Sometimes appdata doesnt get updated properly

Everything works fine, but when i restart the map the fx is'nt playing on the impact point and my script to kill the zombies doesnt work anymore. It's only working correct when i start the map again with 'map' or 'devmap'. Is it possible to fix this isue?

Spoiler: click to open...

#include common_scripts\utility; 
#include maps\_utility;
#include maps\_zombiemode_utility;

main()
{
    flag_wait("all_players_connected");
	level.max_frozen = 24; 
    level.max_freeze_distance = 300;
	players = GetPlayers();
	array_thread(players, ::weapon_fired);
}

weapon_fired()
{
	self endon( "disconnect" );
	self waittill( "spawned_player" ); 
	for( ;; )
	{
		self waittill( "projectile_impact", weapon, impact ); 
		if (weapon == "zombie_colt")
		{
			self thread impact_fx( impact ); 
		}
 
	}
}

impact_fx( impact )
{
	level.bullet = spawn("script_model", impact);
	level.bullet SetModel("tag_origin");
	playfx( level._effect["ww"], level.bullet.origin  + ( 0, 0, 40 ));
	iprintlnbold("Play fx on tag");
 
	zombs = GetAISpeciesArray( "axis", "all" );
    get_AI = zombs;
	close_zoms = get_array_of_closest( impact, get_AI, undefined, level.max_frozen, level.max_freeze_distance );
 
	move_them = [];
	for( i = 0; i < close_zoms.size; i++ )
	{
        if(IsDefined(close_zoms[i].in_the_ground) && close_zoms[i].in_the_ground == true)
		{
            close_zoms[i] super_kill();
            continue;
        }
		move_them[i] = spawn("script_model", close_zoms[i].origin); 
		move_them[i] SetModel("tag_origin"); 
		close_zoms[i] LinkTo( move_them[i] );
		move_them[i] thread zombie_wobble();
		close_zoms[i] thread kill_zoms(); 
	}
 
	wait (6); 
	for( i = 0; i < close_zoms.size; i++ )
	{
		close_zoms[i] unLink( move_them[i] ); 
		move_them[i] delete(); 
	}
 
	level.bullet delete();
}

zombie_wobble()
{
	while (isdefined(self))
	{
		self moveTo(level.bullet.origin, .5, .05, .05);
		waittime = randomfloatrange(2.5, 5);
		yaw = RandomInt( 360 );
		if( yaw > 300 )
		{
			yaw = 300;
		}
		else if( yaw < 60 )
		{
			yaw = 60;
		}
		yaw = self.angles[1] + yaw;
		self rotateto ((-60 + randomint(120), yaw, -45 + randomint(90)), waittime, waittime * 0.5, waittime * 0.5);
		wait randomfloat (waittime - 0.1);
		self thread kill_zoms();
	}
}

kill_zoms()
{
	wait(1.5);
	self DoDamage( self.maxhealth+666, self.origin ); 
	iprintlnbold("7 is Love. 7 is Life.");
    self thread NotifyPlayersOnSpatter();
	self hide(); 
	thread GivePlayersScore(60);
	wait(1.5);  
}

super_kill()
{
	self DoDamage( self.maxhealth+666, self.origin );
    if(IsDefined(self.animname) && self.animname != "zombie_dog" || self.animname != "quad_zombie") {
        self thread NotifyPlayersOnSpatter();
    }
	self hide();
    thread GivePlayersScore(60);
}

blur_vision()
{
	self SetBlur(10.3, 1); 
	wait(1); 
	self SetBlur(0, 1); 
}

wait_for_bloodspatter() {
    for(;;) {
       // self iprintlnbold("Waiting for spatter notify");
       self waittill("spatter", zomb);
       if(DistanceSquared(zomb.origin, self.origin) <= 120000) {
           self.spatter = 1;
           // self iprintlnbold("Should splatter");
           wait(1);
           // self iprintlnbold("Splatter should be done");
           self.splatter = 0;
       }
       else {
           continue;
       }
    }
}

NotifyPlayersOnSpatter() {
    players = GetPlayers();
    for(i=0;i<players.size;i++) {
        players[i] notify("spatter", self);
    }
}

GivePlayersScore(score) {
    players = GetPlayers();
    for(i=0;i<players.size;i++) {
        players[i] maps\_zombiemode_score::add_to_player_score(score*level.zombie_vars["zombie_point_scalar"]);
    }
}

[close]

	self waittill( "spawned_player" );

Ideally instead of doing array thread you should set up 3 functions to wait for the player to connect and another to wait for the player to spawn, and one to wait for the player to fire, you should take a look at the Tesla script to see how it's done there.