You don't have to give them a name if their all the same type, like mine were all monster_zombie, so I set the 'target monster' field to that. It worked, but only for one zombie.
I finally got it to work, but I had to create a scripted sequence for each monster I wanted the monstermaker to spawn. So, if I want 20 monsters to walk around the corner where the player is standing--out of their field of view--I have to make 20 scripted sequences and put them around the corner.
If some one knows how I can achieve this effect with the monstermaker and only one scripted sequence, please let me know.