Also emailing bugs@, wanted to post here in case anyone else runs into this. We've recently enabled Private Caching on Litespeed. Some of the complaints we've started to receive is related to PHPBB. When someone posts a new thread in PHPBB (or replies to an existing one), the page will refresh and their post will not be added. If I wait 180 seconds (for the page to not be cached anymore), it works. I've added posting.php to the 'do not cache' URLs, and posts now work as designed. Can someone take a look at this soon?