Sorry another Beamer question

Hi all,

Thanks for the help about my previous question which came down to incompatibility issues between beamer and graphics (graphicx) which a one-line fix of code at the start of the document can solve (for anyone with the same problem the line to insert at the start of the latex file is   \makeatletter\let\ifGm@compatii\relax\makeatother
and thanks very much to Paul Thompson for passing this fix along to me)

Emboldened, I thought I'd try out a file with PDF graphs called in it.  Needless to say, it did not go well!  The following call within the latex file

\includegraphics[
natheight=10.6913in, natwidth=14.0472in, height=1.2035in, width=1.5733in]
{C:/Users/rtaylor/Dropbox/tex/graphics/1a__1.pdf}

Led to the following error

....  [17] [18] [19] [20] <use C:/Users/rtaylor/Dropbox/tex/graphics/1a__1.pdf>
! Undefined control sequence.
<argument> ...@base \Gin@ext  image\GPT@AttrShort
                                                  \ifx \GPT@print \ltx@empty...
l.758 \end{frame}
                 %
?

Hit return and it compiles but with the graph simply missing from the output.  The same latex file compiles fine (with the graphs included) on other well-known tex platforms such as scientific word and tex writer, so is this another conflict between beamer and graphics?

Many thanks.

Best wishes, Rob Taylor
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