Fade in script only works sometimes

I’ve got a pretty simple script to fade in elements of a floor plan. All elements start with alpha set to 0, then as each one reaches an alpha of 100, the next element fades in.

I tested it at home last night and it was fine. Tried it this morning in its own file and it worked fine. But when I copy and paste all frames into a mc in a larger file, nothin. I can’t even get the elements to be invisible with alpha set to 0.

Here’s the script, it’s pretty simple:

onLoad = function () {
    flrPlanBasetint_mc._alpha = 0;
    flrPlanWalls_mc._alpha = 0;
    flrPlanFurniture_mc._alpha = 0;
    flrPlanLabels_mc._alpha = 0;
    retToGalleryBtn_mc._alpha = 0;
};
onEnterFrame = function () {
    retToGalleryBtn_mc._alpha = retToGalleryBtn_mc._alpha+3;
    flrPlanBasetint_mc._alpha = flrPlanBasetint_mc._alpha+3;
    if (flrPlanBasetint_mc._alpha>=100) {
        flrPlanWalls_mc._alpha = flrPlanWalls_mc._alpha+3;
    }
    if (flrPlanWalls_mc._alpha>=100) {
        flrPlanFurniture_mc._alpha = flrPlanFurniture_mc._alpha+3;
    }
    if (flrPlanFurniture_mc._alpha>=100) {
        flrPlanLabels_mc._alpha = flrPlanLabels_mc._alpha+3;
    }
};