I installed Joomla on my site, and started loading different templates.
Suddenly, when switching templates and refreshing, the default Joomla template appeared. Changed to a different template, refreshed, and still saw default Joomla.
Then I discovered that if I put a www. in front of my sitename in url (in the browser), the correct template appears.
All the menulinks in Joomla point to sitename.com, rather than www.sitename.com...so that sends the site back to the default Joomla template.
Why did this just start happening? I had made about 20 different template changes without an issue.
Help? I don't think this is a Joomla issue; I think it's a domain or Dreamhost issue...just trying to give a good description.