Aca esta el motivo de porque no anda:
This script highlights syntax in code examples on your forum.
It is very easy to use because it works automatically: finds blocks of code, detects a language, highlights it.
Supported languages: HTML/XML, Javascript, CSS, PHP, Ruby, Perl, Python, C++, C#, Java, SQL, Bash.
VB no esta soportado... pero bueno, por lo menos le pone uno que otro color!