I've installed Jekyll-Bootstrap, the redcarpet plugin, and I've tried updating my Ruby to the latest RVM stable. I'm running OS X Mountain Lion (10.8.2).
With this setup, if I insert a code block comment with either standard syntax (indent 4 spaces) or github syntax highlighting (```), I end up with no errors from Jekyll and an empty html file (0 bytes). Pushing it to github produces the very helpful error:
The page build failed with the following error:
page build failed
Any help much appreciated.