b2evo505: I wonder if there is any reason why cached pages are still there when you change a post name or even delete a post! After you delete a post (and logg off) you still see it in the category or blog page (for 10 minutes, or whatever $pagecache_max_age is), and if you click on it (like a normal user would do) you get a 404 page: b2evolution cannot resolve the requested URL.

I think that when you modify a post, the corresponding cached page should be deleted immediately, so the first user who tries to see it get a fresh cached page, and the same applies to blogs and categories pages. Even more so when you delete a post...