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I use beamerposter in order to do a poster and I have some trouble because the contents of the poster is not centered. I tried to do a minimal example. This is the tex file :

\documentclass[final]{beamer} 

\usepackage[T1]{fontenc}

\usetheme{miniposter}
\usepackage[orientation = portrait, size = a0, scale = 1.4]{beamerposter}                       % e.g. for DIN-A0 poster

\usepackage{lipsum}

\title{Title of the poster}
\author[Author]{Author 1, Author 2 \ldots}
\date{2-5 Juillet 2012}
\institute[INSTITUTE]{Institute of wonderthings}

\begin{document}

\begin{frame}{}

\begin{columns}

\begin{column}[t]{0.64\textwidth}

\begin{block}{first block}
    \lipsum[1]
\end{block}

\end{column}
\begin{column}[t]{0.32\textwidth}
\begin{block}{a second block}
    \lipsum[2]
\end{block}
\end{column}
\end{columns}

\end{frame}

\end{document}

For beamerposter you need to create a kind of beamer theme. Here also I tried to put the minimum things just to see something.

\ProvidesPackage{beamerthememiniposter} 

\mode<presentation>

\setbeamercolor{headline}{bg=blue, fg=white}
\setbeamercolor{footline}{bg=blue, fg=white}
\setbeamercolor{author in head/foot}{fg=white, bg=blue}
\setbeamercolor{title in head/foot}{fg=white, bg=blue}
\setbeamercolor{block title}{fg=white,bg=blue}
\setbeamertemplate{navigation symbols}{}  % no navigation on a poster

\setbeamertemplate{headline}{  
  \leavevmode
  \begin{beamercolorbox}[wd=\paperwidth]{headline}
        \Huge
        \inserttitle\par

        \insertauthor\par

        \insertinstitute\par
  \end{beamercolorbox}
}
\mode<all>

This is the output, look at the block at the middle of the page. They are not horizontally centered. They are a little bit on the left side.

enter image description here

I tried some \centering or center environment or \hspace* but I never succeed.

Thanks for your help.

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closed as not a real question by Andrew Swann, lockstep, Guido, Stefan Kottwitz Feb 18 '13 at 11:39

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
It looks OK to me, both in your image and if I run your code locally. Is it the position of the blue header that worries you or the text block underneath each one? the headers span the full width with a gap between as the column widths add up to less that \textwidth –  David Carlisle Jun 12 '12 at 22:55