I just had SyntaxHighlighter Evolved plugin for WordPress wasn’t working, but it has been solved by me. It has made me confused for sure before I find the solution. This is the case:
Recently, I switched the theme to my own built theme. I found the SyntaxHighlighter Evolved didn’t work on the post. So, the problem appeared after I switched TwentyTen theme off.
The solution is terribly simple. Open your footer.php of your theme, then add this line.