Mask doesn't work with desired font

I have a postscript font which I would like to use for my scrolling text box. I have an up and down arrow buttons with AS like this:
on (press) {
mcText.onEnterFrame = function() {
if (this._y>-500) {
this._y -= 10;
}
};
}
on (release) {
mcText.onEnterFrame = null;
}

I have tried dynamic, static settings but the only way I can get the text into the mask is by breaking apart the font. Do not really want to break apart because this increases the size of the file. I can do this dynamically with a device font but want to use a better typographical approach.

Anyone have any clues for solving this?

Your help is most appreciated,
Gaz