Flash MX: Lag?

I’m currently constructing a game and I’ve gotten pretty far. My only problem is that my “hero” seems to not be refreshing as fast as it should. I believe this is because of lag but my CPU usage only ever climbs to a max of 5% when I’m playing it. Does anybody know why this is? The only thing that seems choppy is movement. When the hero swings the sword or destroys something, everything looks fine. It is only movement. I have the fps set at 30. I tried it at 15 and 60. Neither changed anything. Does anybody know how I can fix this or even why it’s just happening? I’m using Flash MX.

EDIT: I’ve also checked my RAM and other aspects of my PC. Nothing is being overused. Thanks even more.

ANOTHER EDIT: hahaha. Okay. This is tiresome right now. My other question still stands and rather than post a new thread I decided to put the next question on here. I have a multidimensional array like this.
example = [[]];
Later, in the code I have an if statement that I only want to go through if example would have something in it.
I’ve tried using:
if (example != null){}
but it doesn’t seem to work. Does anybody know what if statement I should use? I’m sure this is probably simple but an answer would be nice. Google is getting slightly boring. Thanks a billion… and a one.

[RIGHT]Thanks, SoupHead :block:
[/RIGHT]