Button shifts 1 pixel
hi. i have a movieclip added to my scene using as3. the movieclip contains other movieclips and buttons. i use a greensock Tween.to to move the movieclip onto the stage.
for some reason, the buttons shift to the right approximately 1 pixel when i hover over them the first time. nothing else shifts, just the button i hover over. there is no animation on the buttons. they consist of properly aligned png files for the up and down states. the buttons behave normally when used the second time or any time thereafter. once i close the movieclip containing the buttons, and reopen it, the same problem happens again.
thanks very much.