I'm in the process of restructuring our blog, which content wise is quite dynamic and I have managed to migrate pretty much everything to AJAX requests that need to be kept dynamic. So far so good, except a major issue I'd need to get resolved concerning Super Cache: no super-cached pages are being delivered.
(1) I installed the Super Cache plugin per the instructions and it seems to run fine, except for actually delivering <!-- super cached --> pages. The admin page does show both wp-cached and super-cached pages, super cached pages triggered by unknown visitors (file system/folder structure is intact).
(1.1) on occasion, completely unkonwn users get a dynamic page (even though it's already cached!)
(1.2) on reload, unkonwn users then get the <!-- Cached page served by WP-Cache -->
(1.3) but they never get a <!-- super cached --> page?!
*) I use PHPSESSION (COOKIE based) on the blog
*) I use add'l COOKIES on the site, but non would match the .htaccess rules
*) .htaccess rules are the std ones
PS: the site has access restrictions in place, but I'm happy to send you an email on how to access.