Png difference in FP6 vs FP7

All the buttons, scroll “tracker” and scrollbar are attached from the library with actionscript. They are imported png since the corners of the buttons are rounded in windows. Could probably be done with the onebit alpha channel in gif but I’m just used to using png.

I don’t NEED this to work in fp6, it is just an experiment and I was also curious if there was a difference between fp6 and 7. It was.

Anyone know if it’s fixable or if it’s a png limitation with flash player 6?

The swf is fp7 exported.