To clarify a little:
I have the site set up so that there is no logo or header, and the SE reads the text site name and tagline first. Then it is reading stuff like "About", etc.
I am using yoast, and have been for a good while. I am nearly positive that I have set the meta description on it, but I'll double check that.
The theme is Prose from StudioPress.
Thanks for all the suggestions so far!
