Show the script your using for moving the AI.

its basically a exact copy and condensed version of maps\_zombiemode_spawner (not all of it just parts i think i might need)
http://pastebin.com/4ZXjQm6G

sloth_pathing()
{
	structs = getStructArray("sloth_pathing", "targetname");

	if(!isdefined(structs))
		return;

	while(1)
	{
		if(level.special_item_taken && !level.sloth_hurt) // if the candy/booze has been taken from the spot by a player
		{
		        players = get_players();
			for(k=0;k<players.size;k++)
			{
				if(players[k].has_booze || players[k].has_candy)
					goal = players[k];
			}
		}
		else if(!level.special_item_taken && !level.sloth_hurt)
		{
			for(i=0;i<structs.size;i++)
			{
				if(isdefined(structs[i].target) && structs[i].target > 1)
					goal = random(structs[i].target);
                               else if(isdefined(structs[i]))
                                        goal = structs[i].target;
			}
		}
		else if(!level.special_item_take && level.sloth_hurt)
			goal = getstruct("sloth_cage_struct", "targetname");
                wait(1);
		self setGoalEntity(goal);
	}
}

For creating a ai chain/roaming i would suggest just using structs that target each other that the ai will follow. Something like:

sloth_pathing()
{
	structs = getStructArray("sloth_pathing", "targetname");

	if(!isdefined(structs))
		return;

	while(1)
	{
		if(level.special_item_taken && !level.sloth_hurt) // if the candy/booze has been taken from the spot by a player
		{
		        players = get_players();
			for(k=0;k<players.size;k++)
			{
				if(players[k].has_booze || players[k].has_candy)
					goal = players[k];
			}
		}
		else if(!level.special_item_taken && !level.sloth_hurt)
		{
			for(i=0;i<structs.size;i++)
			{
				if(isdefined(structs[i].target) && structs[i].target > 1)
					goal = random(structs[i].target);
                               else if(isdefined(structs[i]))
                                        goal = structs[i].target;
			}
		}
		else if(!level.special_item_take && level.sloth_hurt)
			goal = getstruct("sloth_cage_struct", "targetname");
                wait(1);
		self setGoalEntity(goal);
	}
}

Edit: SetGoalNode should be setGoalEntity. Hopefully it'll work fro structs.

Edit 2: if setGoalEntity doesn't work you can also just get the closest pathnode from the struct and set the goal that way too. Bit tired ATM, so sorry if i'm not being clear enough. lol