from the screenshot, it's correct result.
please look at the cookie from the screenshot:
when these strings exist in cookie, indicate that this is a logged in user, so NOT return the cache. cache is for guest only.
so you just logout and visit your forum again as a guest, you'll see the cache hit header.
another suggestion : now guest cache time set to 120 seconds(i.e., 2 minutes), you can increase it to 5 minutes, 10/15/30 etc, since the cache is for guest users only.
this will improve the performance for both guest and logged in users. people will feel your forum faster, response quickly.
Last edited by NiteWave; 05-13-2013 at 11:19 PM..