Somehow there is a limit?

 public static void LoadMobs(bool Reload = false)
            {
            string[] FMobs;
            if (!World.LowRatedServer)
                FMobs = File.ReadAllLines(@"C:\" + Program.DBPath + @"\MobInfos.txt");
            else FMobs = File.ReadAllLines(@"C:\" + Program.DBPath + @"\MobInfosLowRates.txt");
            var Mobs = new Hashtable(FMobs.Length);
            for (var i = 0; i < FMobs.Length; i++)
                if (FMobs[i][0] != '*')
                {
                    var M = new Mob(FMobs[i]);
                    Mobs.Add(M.MobID, M);
                }

            var MobsCount = 0;
            if (Reload)
            {
                foreach (Hashtable H in World.H_Mobs.Values)
                    H.Clear();
                World.H_Mobs.Clear();
            }

            string[] FSpawns = File.ReadAllLines(@"C:\" + Program.DBPath + @"\MobSpawns.txt");
            foreach (string Spawn in FSpawns)
            {
                if (Spawn[0] == '*') return;
                string[] SpawnInfo = Spawn.Split(' ');
                int MobID = int.Parse(SpawnInfo[0]);
                int Count = int.Parse(SpawnInfo[1]);
                uint Map = uint.Parse(SpawnInfo[2]); //ushort //is this map id? yes
                ushort XFrom = ushort.Parse(SpawnInfo[3]);
                ushort YFrom = ushort.Parse(SpawnInfo[4]);
                ushort XTo = ushort.Parse(SpawnInfo[5]);
                ushort YTo = ushort.Parse(SpawnInfo[6]);
                if (!World.H_Mobs.Contains(Map))
                {
                    World.H_Mobs.Add(Map, new Hashtable());
                    if (!Reload) //(!Game.World.PlayersInMap.ContainsKey(Map))  //Valis fix for reloading mob spawns
                        World.PlayersInMap.Add(Map, new ThreadSafeDictionary<uint, Character>(400));
                }

                var MapMobs = (Hashtable) World.H_Mobs[Map];
                var D = (DMap) DMaps.H_DMaps[Map];

                for (var i = 0; i < Count; i++)
                {
                    var _Mob = new Mob((Mob) Mobs[MobID]);
                    _Mob.Loc = new Location();
                    _Mob.Loc.Map = Map;
                    _Mob.Loc.X = (ushort) Program.Rnd.Next(Math.Min(XFrom, XTo), Math.Max(XFrom, XTo));
                    _Mob.Loc.Y = (ushort) Program.Rnd.Next(Math.Min(YFrom, YTo), Math.Max(YFrom, YTo));

                    try
                    {
                        while (D != null && D.GetCell(_Mob.Loc.X, _Mob.Loc.Y).NoAccess)
                        {
                            _Mob.Loc.X = (ushort) Program.Rnd.Next(Math.Min(XFrom, XTo), Math.Max(XFrom, XTo));
                            _Mob.Loc.Y = (ushort) Program.Rnd.Next(Math.Min(YFrom, YTo), Math.Max(YFrom, YTo));
                        }
                    }
                    catch
                    {
                        World.ExcAdd += "Mobid: " + _Mob.MobID + " Mob.X: " + _Mob.Loc.X + " Mob.Y: " + _Mob.Loc.Y +
                                        " Mob.map: " + _Mob.Loc.Map + " MOBERROR! \r\n";
                    }

                   // _Mob.StartLoc = _Mob.Loc;
                    _Mob.StartLoc.XFrom = XFrom;
                    _Mob.StartLoc.XTo = XTo;
                    _Mob.StartLoc.YFrom = YFrom;
                    _Mob.StartLoc.Yto = YTo;
                    _Mob.StartLoc.Map = Map;
                    _Mob.EntityID = IdentityGenerator.Monster.GetNextIdentity;
                    //_Mob.EntityID = (uint) Program.Rnd.Next(400000, 500000);
                    //while (MapMobs.Contains(_Mob.EntityID))
                        //_Mob.EntityID = (uint) Program.Rnd.Next(400000, 500000);
                    MapMobs.Add(_Mob.EntityID, _Mob);
                    MobsCount++;
                    _Mob.LastTarget = DateTime.Now;
                    if (_Mob.MobID == 701 || _Mob.MobID == 700 || _Mob.MobID == 150 || _Mob.MobID == 500 ||
                        _Mob.MobID == 4000 || _Mob.MobID == 4008 || _Mob.MobID == 409 || _Mob.MobID == 266 ||
                        _Mob.MobID == 4152 || _Mob.MobID == 4171 || _Mob.MobID == 4172 || _Mob.MobID == 4170 ||
                        _Mob.MobID == 3823 || _Mob.MobID == 3822 || _Mob.MobID == 3821 || _Mob.MobID == 8423 ||
                        _Mob.MobID == 4010 || _Mob.MobID == 4011 || _Mob.MobID == 4012 || _Mob.MobID == 4013 ||
                        _Mob.MobID == 4014) // ultimatepluto, expmob, *dbdevil*, waterdevilking, teratodragon
                    {
                        _Mob.Alive = false;
                        _Mob.CurrentHP = 0;
                    }
                }
            }

            if (Reload)
                World.SendMsgToAll("SYSTEM", "Monsters reloaded!", 2011, 0);
            World.DebugAdd += "Monsters loaded " + MobsCount + "\r\n";
        }