[OS X TeX] pdflatex warning

[Themis Matsoukas]

I get the following warning while running pdflatex

Warning: /usr/local/teTeX/bin/powerpc-apple-darwin-current/pdflatex  
(file ./fig
ures/fig1_trapped.pdf): pdf inclusion: Page Group detected which  
pdfTeX can't h
andle. Ignoring it.

Does anyone know what that means? I can't see an obvious problem (the  
figure is included properly) but before I send this proposal I'd like  
to know what's causing the warning.

Thanks.

Themis
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