I use the WordPress plugin Advanced Category Excluder to hide a few categories from the front page. When I upgraded my (this) server to PHP 5.3 yesterday, the plugin broke any WordPress site where I had it running.
This fixes it:
for php 5.3 change the lines
function ace_where(&$where,$filter="")
function ace_join(&$join,$filter="")to
function ace_where($where,$filter="")
function ace_join($join,$filter="")in
advanced-category-excluder.php
Thanks a lot. Really solved my issue with less changes.