Problem with mask

I have some trouble when I try to mask a movie clip that I want to control.

To make it easier to understand, see the swf HERE

The buttons set a variable (‘option’) to ‘text1’, ‘text2’ or ‘text3’ and tell the boxes below to go and play the transition. (The boxes are the same mc, but the second has no masking)

The transition (on the first box) is a mask that ‘zooms’ out and in (to make the number disappear and then appear with a new number).

When the number has disappeared a short line tells the number-mc to goto the value of the ‘option’-variable (i.e. frame labeled ‘text2’) and then appear.

Problem is that the mc doesn’t go to the desired frame label.
As you can see on the box to the right it works perfectly when there is no masking. Howcome???

HERE IS THE .fla IF YOU NEED IT