Problem with displaying text

Hi guys,

I was wondering if you could help me out with a problem.

The file contents:
two separate buttons
two separate movie clips containing a couple of buttons which have been grouped together.

One button points to one movie clip and the other button to the other movie clip as it rightfully should.

There is also a mask layer above the two movie clips. This was done in order to display the movie clips in a particular area only.

the first movie clip that is supposed to run is running properly as there is no need for any action scripting as it is displayed once you enter the site. On the other hand when I click on the second button to display the second piece of text, I am faced with a blank screen. Is this because of the mask. I know the movie clip is being targeted as it works when i remove the mask.

The layers are currently displayed like so:

Masklayer
2nd MC
1st MC