I have a full https site with the WF cache options set to cache https pages. Wordfence is caching the pages (and excluding Woocommerce basket, checkout etc correctly) but as far as I can tell the cached version of a page is not being used.
I've refreshed pages numerous times, cleared caches, checked via the hidemyass proxy and still no message appears in the html to confirm the page is a cached version.
My htaccess only contains rules from Wordfence, the usual WP rewrites, plus a bit for web fonts and to force IE to use its latest version. There's nothing I can see that would cause a conflict.
I've no other caching or security plugins. Any idea what could be the problem here?
Thanks in advance for your help.