This plugin seems to be incompatible with wordpress in languages other than english.
As soon as I set "WPLANG" to "pt_BR" in my wp-config.php, my admin interface stops working (500 - internal server error) when the plugin is activated. The plugin still works in the blog posts (syntax is highlighted), it's just the admin interface that stops working. If I disable the plugin, my admin interface starts working again.
Is there any workaround?