ActionScript 3.0 :: Instanced MovieClips Not Moving Across Stage

I'm making a screensaver where random characters in different positions and sizes walk/run across the screen. It seemed simple enough, and everything appears as they should. However, none of the Movieclips move forward on the stage. Here's the code on the first frame of the timeline, bolded lines are points of possible concern:

Code:
import flash.utils.*;
var timer:Timer=new Timer(5555);
timer.addEventListener(TimerEvent.TIMER, makeCharacter);
timer.start();
function makeCharacter(e:TimerEvent):void {
[Code] .....

And here's the code found in each movieclip:
var isOnStage:Boolean = true;
With no errors to go off of, I'm unsure how to proceed.