GRAY BOXES IN PDF

[Michael Zaichenko]

Hi there,
FM 7.1 Win XP SP2, Acrobat 7.0 Pitstop 7.0.
I'm making a PDF file from FM file that contains TIFF images (bitmap) RGB 
equivalent (Black and white). When converting to Gray in Acrobat with 
Pitstop a gray box appears around the art. Though it is possible to remove 
the box it is not optimum. Box is 98.8% Gray.
This problem didn't exist with Pitstop 6.
I'm using Acrobat Distiller 6.0. TIFF image is 600 dpi. Distiller setting is 
300 dpi if this matters.
Did anyone come across such a thing?
Michael

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