[Plugin: SyntaxHighlighter Evolved] Why can’t work on mysite?

when i add this in my artice <pre class="brush: php;"> only
this will not work,

but when i add the [sourcecode language="php"] in any code field title then <pre class="brush: php;"> will work fine.

so,any idea?

ex,http://www.cnspeak.com/index.php/2009/05/talk-about-the-all-in-one-seo-pack-from-the-chinese-description-of-the-problem-automatically.html