[Tex/LaTex] Beamer: default block not displayed

beamerblock

I am currently using Beamer to create a presentation. I'd like to use blocks, as I already did several times in the past, but it seems not to work properly. For instance, the following example displays in dark blue 'Title' and in black 'Example', with no background at all. 

\documentclass{beamer}
\usetheme{Pittsburgh}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}

\begin{document}
\begin{frame}
\begin{block}{Title}
Example
\end{block}
\end{frame}
\end{document}

I know how to customize block environments, but I'd like to understand why the default one is not working as I was expecting. Please correct me if this is the normal behaviour of blocks using Pittsburgh theme.

Best Answer

Looks perfectly normal. See also the example on page 149 of the manual, no background on the blocks there.

beamerthemePittsburgh.sty contains just

\ProvidesPackageRCS $Header: /Users/joseph/Documents/LaTeX/beamer/base/themes/theme/beamerthemePittsburgh.sty,v d02a7cf4d8ae 2010/06/17 09:11:41 rivanvx $


\mode<presentation>

\setbeamertemplate{frametitle}[default][right]

\useinnertheme{circles}

\mode
<all>

So it looks like it uses the same colours as the default colour theme, which also doesn't have any background colour on the blocks.

Related Question