An annoying bug in the new version of SyntaxHighlighter 3 shows vertical scrollbar on every code snippet.
To fix this, SSH to your hosting and change the code under syntaxhighlighter/syntaxhighlighter3/styles/shCore.css
and change:
.syntaxhighlighter { ... overflow: auto !important; ... }
to:
.syntaxhighlighter { ... overflow: hidden !important; ... }
Proof: Did you see vertical scrollbar on my snippet?