pdflatex and PDF includegraphics problem

[Marko SchÃtz Schmuck <MarkoSchuetz%web.de@localhost>]

Dear All,

recently I upgraded my packages. Now, with teTeX-3.0nb9,
inkscape-0.48.0nb2, dia-0.97.1nb4, ghostscript-8.71nb7, and
kdegraphics-3.5.10nb10 I have problems including PDF files in
pdflatex. 

With test.tex containing:

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[width=10em]{./ListRanking-conv.pdf}
\end{document}

where ListRanking-conv.pdf was converted by

pdf2ps ListRanking.pdf
ps2pdf13 ListRanking.ps ListRanking-conv.pdf

I get

<./ListRanking.pdfassertion "!obj1->isNull()" failed: file 
"pdftexdir/pdftoepdf.cc", line 978, function "void write_epdf()"

If I use ListRanking.pdf directly (either converted with inkscape from
a dia SVG or written directly from dia), I get the same result.

A file Amdahl.pdf written by gnuplot-4.2.6nb4 does not trigger this
error.

So far I haven't found any promising hints as to how to solve this.

Any suggestions/hints are welcome.

Thanks and best regards,

Marko

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