Quick Cache not caching single post

Hi,

Just installed quick cache and see the following when the source code is viewed for the home page.

<!– This Quick Cache file was built for ( http://www.virtualpreacher.org/ ) in 0.89045 seconds, on May 27th, 2013 at 5:59 am UTC. –>
<!– This Quick Cache file will automatically expire ( and be re-built automatically ) on May 27th, 2013 at 6:59 am UTC –>
<!– +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ –>
<!– Quick Cache Is Fully Functional 🙂 … A Quick Cache file was just served for ( http://www.virtualpreacher.org/ ) in 0.00062 seconds, on May 27th, 2013 at 6:14 am UTC. –>

However I don’t see it in the source code of any of the single posts (ex: http://www.virtualpreacher.org/sermon-outlines/sermon-parable-pharisee-publican/)

http://ww.wp.xz.cn/extend/plugins/quick-cache/