itemize within tables is no longer working

Hi,
I'm new to the list (and new to LaTeX).

After upgrading MiKTeX to the latest version yesterday evening I'm
unable to compile a document containing an \begin{itemize} ...
\end{itemize} construction.
The problem occurs using the packages tabulary and tabularx.

<code>
\documentclass[fontsize=11pt, paper=a4, twoside, headinclude,
footinclude, headsepline, footsepline, BCOR=5mm]{scrreprt}
\usepackage[lmargin=2.5cm,rmargin=2.5cm,tmargin=2.5cm,bmargin=3.5cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage[english,ngerman]{babel}
\usepackage{tabularx}
\usepackage{tabulary}
\setlength{\tymin}{50pt}
\setlength{\tymax}{\linewidth}

\begin{document}
\begin{table}[hbt!]
\captionabove{Test Table}
\label{tab:Test Table}
\centering
%    \begin{tabulary}{\textwidth}{LL}
    \begin{tabularx}{\textwidth}{LL}
    \rowcolor{black!90}
    \toprule
    \color{white}\textbf{Column 1} & \color{white}\textbf{Column 2}\\
    \midrule
    Row 1/Col 1 & Row 1/Col 2:
            \begin{itemize}
                \item Item 1 with a long text which must be wrapped into
the next line
                \item Item 2 with a long text which must be wrapped into
the next line
            \end{itemize}\\
    \hline
    Row 2/Col 1 & Row 2/Col 2\\
    \hline
    Row 3/Col 1 & Row 3/Col 2 and again, a column with a long text which
must be wrapped into the next line\\
    \hline
    Row 4/Col 1 & Row 4/Col 2\\
    \bottomrule
    \end{tabularx}
%        \end{tabulary}
\end{table}
\end{document}
</code>

The errormessages are:
tabularx:
Zeile 34: Missing # inserted in alignment preamble \end{tabularx}
Zeile 34: Missing # inserted in alignment preamble \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Missing # inserted in alignment preamble \end{tabularx}
Zeile 34: Missing # inserted in alignment preamble \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Missing # inserted in alignment preamble \end{tabularx}
Zeile 34: Missing # inserted in alignment preamble \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Something's wrong--perhaps a missing \item. \end{tabularx}
Zeile 34: Undefined control sequence \end{tabularx}
Zeile 34: Overfull \hbox (391.09126pt too wide) in alignment

tabulary:
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Something's wrong--perhaps a missing \item. \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}
Zeile 35: Undefined control sequence \end{tabulary}

Vor dem Upgrade funktionierte das ganze tadellos (getestet mit
tabularx). Vorher hatte ich die Version von Mitte Juli'11.

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