[Tex/LaTex] latex-beamer: ambiguous highlighting with \setbeamercovered{transparent}

beamertransparency

I am having problems with the following piece of code:

\documentclass{beamer}
\setbeamercovered{transparent}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}
\begin{frame}
\begin{itemize}
\item<alert@4-> a
\pause
\item b
\pause
\item c
\pause
\end{itemize}
\end{frame}
\end{document}

I want to have a,b and c highlighted one after one, and in the end alert the first item. Unfortunately on page one of the generated document b is already highlighted, although only a should be.

Here's an image of the first slide:

What did I do wrong?

Best Answer

\documentclass{beamer}
\setbeamercovered{transparent}

\begin{document}

\begin{frame}
\begin{itemize}
\item<1-|alert@4-> a
\item<2-> b
\item<3-> c
\end{itemize}
\end{frame}

\end{document}
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