I am fairly sure that this has nothing to do with my RocketTheme template, however I am wondering if any person might have the same issue with their Joomla installation..
Periodically I wind up with having a blank index.html placed in my root directory (/public_html/), which of course overrides Joomla's index.php and leaves me with a blank site. So I login, delete index.html, and away I go again.