corporate theme - blog search not working

Using the great corporate theme, and the blog search on the main page is not working - it returns no matches, even on searches that should match.

If I search with no criteria, all blogs show up in the results, so it is clearly not just searching the main blog, it is searching site-wide...just not working when actual criteria is submitted.

The members search works great - same form, same site, etc.

Also after submit, the search type drop-down always jumps to "members", regardless of the previously submitted search type, and does not display the submitted criteria.

Please help. Thank you.