Pre-loader problem

First time poster alert!

Hi. I’ve been trying to get the Flash MX preloader tutorial working with an .FLA I’ve created. As you can see from the attached file, the movie strobes rather than loading completely.

I’ve moved the frames of my movie to begin at frame 10 and amended the actionscript to point to that frame. Other than that, I have not changed the preloader I downloaded from:

The preloader routine is in the top 4 frames and my movie is in the bottom 4.

Can anyone give me a clue as to why my movie isn’t loading correctly?

Thanks in advance,