I followed the tutorial and my animation is the logo at fazal.tk. I set the boundaries to the size of the movie but the mcs still sometimes still go partially of the movie.
The location of the clip is moved via the registration point, not the whole clip. Therefore even if your registration point falls within the correct boundaries, the contents of your clip may go a bit off the edge.
Would making the boundary smaller than the size of the swf help?
I think so, not exactly sure, I don’t really have time to check out the code used in that tutorial right now, so give it a try and see what happens 
