Last week I was helping a friend set up a new Joomla web site. I've done quite a few of them, so there were no problems with the installation. Everything was working fine until I installed the Leviathan theme from RocketThemes.com. When I tried to open the home page, all I got was a blank, white page.
When I viewed the page source, I saw that only 3 or 4 lines of html had been sent to the browser, and the last line was Joomla PHP code that should have been stripped out.