The latest trac upgrades have managed to take up all my cpu resources and lose its html preview ability.

The cpu resource issue seemed to be related to running with mod_python so right now its running as just plain cgi, the "html preview not available" issue is related to an upgraded trac.ini, make sure your trac.ini has the following, as related to the system its installed on and where your php is.


[mimeviewer]
php_path = /usr/local/bin/php


Just a quick tip from your local trac loving user ;()