LaTeX.org

Hi,

I have recently noticed that the arrow in my \overrightarrow command is larger than it is supposed to be. When I compile (MiKTeX 2.8):
\documentclass{book}

\begin{document}
$\overrightarrow{abc}$
\end{document}
my output looks like
bad.png
but it is supposed to look like
good.png
It ...