#116 \usebox with \Logo confuses styles

[Anonymous]

in epslatex the author describes a methode to avoid
reloading of grahics. I tried that with prosper Logo
and found the logo on a wrong place and the text had
and offset to right.

my command chain: latex -> dvipdf -> xpdf

%%This works fine with prosper
\Logo(8,6.9){\includegraphics[width=2cm]{logo.eps}}

%% causing displacements
\newsavebox{\mylogo}
\sbox{\mylogo}{\includegraphics[width=2cm]{logo.eps}}
\Logo(8,6.9){\usebox{\mylogo}}

% my header
\documentclass[slideColor,colorBG,pdf,contemporain]{prosper}
\usepackage{pstricks,pst-node,pst-text,pst-3d}
\DeclareMathVersion{bold} %%%%%%%%%%% WM for prosper