Page cache stopped working with 0.9.2.8

When ONLY page cache is enabled, I get the below … although its not working, because it keeps serving a new page and updating the time stamp each time:

<!– Performance optimized by W3 Total Cache. Learn more: http://www.w3-edge.com/wordpress-plugins/

Page Caching using disk: enhanced

Served from: thehouseproject.info @ 2013-03-01 06:41:26 by W3 Total Cache –>

If I activate Minify, it even removes the status for page cache … although its still not working, regardless:

<!– Performance optimized by W3 Total Cache. Learn more: http://www.w3-edge.com/wordpress-plugins/

Minified using disk: basic
Page Caching using disk: enhanced

Served from: thehouseproject.info @ 2013-03-01 06:42:47 by W3 Total Cache –>

I been doing intensive testing, disabled all plugins, and page cache is still not working. As you can see for any URL (f.ex thehouseproject.info/support/introducing-embedded-videos/), it will always serve a new date-stamp, although Page-caching is clearly enabled in debugger.

Furthermore, I have checked the folder wp-content/cache/page_enhanced/, and it is not writing any cache files there. It has created the folder, and also added a *htaccess file, but no cache files/folders get added to this folder … http://d.pr/i/lLSA … It doesnt report any permission errors, and it can obviously write since it makes the folder and adds a *htaccess file. Why is it not creating page cache files?