a problem with importing layered PSD file into Flash

Hi.

There's a problem with importing layered PSD file into Flash.

If I import a layered PSD file, some part the color of the lower layer is shown at the edge of objects or shadows. Instead, if I crop each layers first and import them, there's no problem.

If the higher layer has brush or transparent effects, it becomes worse.

Any help with this problem?

Thanks.