PNG's with transparency resulting in slight tone

I've got project where I've been fading in some lower thirds, basically graphics of text imported as PNG with alpha channels created in Photosohp. The transparency is working fine, except there seems to be a very slight color shift as the graphics fade in and disappears as they fade out.
My first guess was that there's some sort of a tone where the transparency is supposed to be, but I can't seem to find any. Does anyone have an idea what this might be?
Thanks,
Bob

This is in FCP-7 or FCP-X?
If X, you need to post here:
https://discussions.apple.com/community/professional_applications/final_cut_pro_ x
as this is the forum for pre-FCP-X iterations.
I would expect there would be some apparent color change during the transitions as the ramping transparency of the graphic would cause whatever background color is behind it to be appear to be "mixed" with the color of the graphic.
MtD

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