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The BBCode in my post is being replaced with <pre>'s just fine, but I don't see the syntax highlighting!

Make sure your theme's footer has <?php wp_footer(); ?> somewhere in it, otherwise the JavaScript highlighting files won't be loaded.

I still see the BBCode in my post. What gives?

Make sure you correctly use the BBCode with a valid language attribute. A malformed usage of it won't result in replacement.

I use the visual editor, my code has lots of line breaks inserted, what do I do?

Use 'shift + return' instead of 'return' when changing lines.