In both FF3/FF2 I've set New Image to 1024x1024 to match the canvas size of my PS image.  Using the PS filter on the image only produces partial coverage of the PS image.  Is there a limitation to the maximum size of the PS image to which the FF filter can be applied?  I've tried a few variations to get around the limitation, applying the filter to smaller layers, merging, but nothing I've tried has worked so far.  This is feeling like operator-error to me.
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