Aligning the equals sign '=' with several equations doesn't seem to work with \begin{eqnarray*} and \end{eqnarray*}.

When I use this code:

\begin{eqnarray*}

6 &=& 1 + 2 + 3 \\

&=& 1 \cdot 2 \cdot 3 \\

\end{eqnarray*}

I get

.

What's going on here?

I see how active the calculus forum is and I would love to be able to use this feature.