I've been having problems with SyntaxHighlighter Evolved. Any code is rendered as a monospaced font, but there is no other decoration (syntax highlighting, line numbers, etc.). I had it working before, but now I'm not getting the correct output. I've made sure the header/footer contains the proper WP calls.
Per another comment on another site, I disabled and reenabled the W3 Total Cache plugin and it worked for a short time, but now I can't get it to work even after disabling all of my caching plugins.
Here is an example page from my site where it's not working: