Upgraded – now Single Posts won’t show

Hi All:

I just upgraded WP to 2.5, and my theme to Mandigo 1.32. Most things are working correctly, but when I click on the title of a post on my home page, instead of being taken to a page with my familiar header and the full content of just that one post (plus the opportunity to comment), I get a completely blank page.

Viewing source reveals that there’s absolutely nothing there.

Anyone with an idea as to what might be wrong here?

Thanks!