Intersecting Layers with alpha problem

Hi,
I have a problem with Motion when two layers intersect. On layer is totally opaque, and the second layer has transparent areas. The problem occurs in areas when the transparent areas intersect with opaque areas. In those regions I get a dark gray line appearing.
Check out this image and you will see what I mean.
http://jack.fxhome.com/MotionLine.jpg
Note: I get this unwanted line in the exported frame as well.
Why does motion do this?
Is there anyway around this?
Thanks

1) Try setting your Render Quality to Best (under the View pop-up menu)
2) Try changing the alpha interpretation of the layer with transparency - select it, press Shift-F, and try the different options in the Inspector's Media tab.

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