Problem with mask

I am currently editing a video of a play in which the cast dropped fake snow which looked great for the audience but, unfortunately, is not visible to the camera. I have added snow using Particle Playground's Cannon exploder which looks great but it should not be falling on the audience's heads ! I have added a mask to the snow layer but is not hiding the snow. I can't understand why not. I've tried leaving the condition at "add" and ticking the "inverted box and leaving the "inverted" box empty and changing the condition to subtract; but the snow is still visible inside the mask. Does anyone know what I'm doing wrong ? I have used masks before without any trouble...help ! btw I am using CS5 on Win 7.
Regards,
TL.

Your screen shot has been reduced in size so much that I cannot read anything on this computer but I'll give this a shot. I think that you didn't move the snow effect into the pre-comp. If you reveal the Effects Control Panel do you still see Particle World?
Here's what I would do.
Duplicate your footage
Add a black solid above the top copy of the footage
Change the blend mode of the black solid to screen
Draw and if necessary animate the mask so that it follows the audience movement
Set the black solid as a track matte for the top copy of the footage
Add a new solid to the comp and put it just above the bottom audience footage
Apply your snow effect to that footage.
Now you've got a layer of just the audience over a layer of snow effect over the original footage. Experiment with blend modes for the snow layer and you should be done.

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Date: Fri, 26 Mar 2010 08:39:42 -0600
From: [email protected]
To: [email protected]
Subject: Problem with Masked Buttons
does your start button overlay the other buttons?
is your start button on the main timeline?
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does that movieclip respond to the mouse (and thereby intercept mouse events intended for the buttons it contains)?
>

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Thanks for writing back Dave and Rick,
I think there is something in what Dave said about opening a new layer window, but it still isn't working right. Please see the screenshot of two full project windows below.
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I have been experimenting with two images with Photoshop. I agree that masking is a non destructive method of editing your image, but when you choose to use the decontaminate color option the refine edge feature automatically changes from new mask to new layer with mask indicating that the decontamination is destructive.
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