I have noticed that a number of our pages are not being saved in the cache directory ('wp-content/cache/page_enchanced/url/') and consequently the pages are re-generated on every request. All these pages have in common is the use of fetch_feed() to list items from different blogs. When I commented out the fetch_feed() function the cache works correctly. I also tried enabling 'Cache feeds', but it did not solve the issue.
Is any one experiencing this issue? or is just a configuration problem?
We are using W3 Total Cache 0.9.2.8 and WP 3.5.1.