[fl8 as2] using alpha with static text

I converted a static text field to a mc then thirty frames later inserted a keyframe and droped the mc’s alpha to zero… then created a motion tween between the keyframes… yet for some reason the text isnt fading when I test the movie… it works fine in the flash authoring environment as you click through the frames but it doesnt in the test movie mode… any suggestions? ( i broke the text apart down to shapes and it worked fine, but that of course will cause indexing problems for content with google so this really isnt an option)