I'm hoping the Joomla experts can shed some light on this one.

I have a Joomla installation that isn't being very nice. Accessing the home page throws a 500 error. I'm able to log into the adminstration area, but none of the admin pages show any content. I'm attaching a screenshot of the global config page. Every admin page is like that. The header loads fine as does the page title and the action buttons on the right but that's it.

Here's what I've tried so far:

1. Viewed the source on the admin pages. The pages finish rendering (i.e. the closing body and html tags are present)
2. Checked error log - Nothing in there.
3. Verified there is data to be displayed. The jos_content DB table has 108 rows.

Anyone had this happen before? Can someone point me in the right direction?