iOS/AIR GPU accelerated Alpha Fade Problem

When I alpha fade a displayobject using Greensock with GPU acceleration enabled on an Adobe Air iOS app, objects will flicker at full opacity just as the entire object somewhere near the end of the fade to 0 alpha. I find this flickering occurs even when I don't fade to 0 alpha, and only on objects that are fading out (rather than fading in). The problem also seems to be specific to objects with TextFields (I use classic TextFields).

Any thoughts as to why this is happening and what I can do about it?

Kevin