[QUOTE=vee41] In your every tick event you are setting direction to random, that would cause the spinning. Move that under the random condition. Also take out 'female_zombie_direction' conditions away from under that condition, and move them to the top level. You can remove the every tick condition all together. Might work. :)
EDIT: Also, rather than round/random use choose(0,1,2,3)[/QUOTE]
Thanks for the help, Vee.
I've made some changes based on your advice, and it's working great except one particular point. I'm now getting all of the female zombies changing direction together.
I realize it has something to do with picking a random zombie instance, but after about half an hour of toying with different placements, I'm not sure what else to change.
Here's where I'm at right now.