Very new and stuck with animating Movie Clip in layer

I'm very new to Flash (CS4) and after searching for a solution to looping a layer I understand this is best done by creating a new Movie Clip and creating the animation to be looped here.

I've done this, and then placed the Movie Clip into a layer on the Scene... but it just won't play at all. It acts like I've placed just the symbol that shows in frame 1 of the Movie Clip and it remains static.

What am I missing?

I've found the problem... not really a problem just not something I had considered.

I kept looking at the editor itself, using the timeline or just hitting enter. It actually works fine when I do a 'test movie'.

I just expected something like this to work (like other software such as AfterEffects usually would).

Back on track now!

Cheers