I can't explain it. I deactivated the plug in, tried another search enhancer, and gave up on it. Reactivated Better Search for a second time, and this time it stayed working. Bizarre.
BTW - I did find these errors while it wasn't working.
[Fri Apr 04 02:23:42 2014] [error] [client 22.214.171.124] WordPress database error The used table type doesn't support FULLTEXT indexes for query SELECT ID, (MATCH(post_title) AGAINST ('Methodology' IN BOOLEAN MODE ) * 1 ) + (MATCH(post_content) AGAINST ('Methodology' IN BOOLEAN MODE) * 3 ) AS score FROM wp_posts WHERE MATCH (post_title,post_content) AGAINST ('Methodology' IN BOOLEAN MODE) AND post_status = 'publish' AND ( post_type = 'post' OR post_type = 'page' OR post_type = 'product' OR post_type = 'event' OR post_type = 'testimonial' ) ORDER BY score DESC /* From [280group.com/?s=Methodology&post_type=product&submit=Search] in [/nas/wp/www/cluster-1359/main280website/wp-content/plugins/better-search/better-search.php:323] */ made by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), do_action('template_redirect'), call_user_func_array, bsearch_template_redirect, include_once('/themes/280GroupCanvas-Child/better-search-template.php'), get_bsearch_results, get_bsearch_matches, referer: http://280group.com/product-management-methodology/