Drawing artifacts with motion under a gradient mask

Hello,
I am having an issue with using a motion under a gradient mask and was hoping someone might have a solution. I have a transparent png bubble in movie clips that are being randomly sized and animation started using code. The design has a reflection and I am using a gradient mask for the effect. The issue is when the bubbles animate they are causing drawing artifacts. Please see the attached screen shot or you can see the swf here - http://archetypeworks.com/test/tm/. Below is the code I am using to set the mask. Any help or suggestions are appreciated.
Code:
bottomMask.cacheAsBitmap = true;
beaker_bottom.cacheAsBitmap = true;
beaker_bottom.mask = bottomMask;
Thank you,
Ococ

Thank you for the suggestion, but that did not work. I also tried breaking apart the png, using the magic wand to select and delete the transparent areas. Still getting the same issue.

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Message was edited by: obhi

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Message was edited by: motoredd

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veverica wrote:
> Am I missing something obvious or is it not possible to
apply a motion guide
> layer (with a path) to a mask (mc or graphic instance)
or masked object?
>
> Any suggestions are greatly appreciated.
>
> Of course the ideal way around this would be to move the
mask with AS, but my
> scripting ability is not -= to the task just yet. I have
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> straight along _x and _y okay w. script but I'd like to
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