on a clean install 1.3.7, the only modification has been the seo contribution.
with the FIX:
Mar 2nd, 2007 Mar 2nd, 2007 Class CoreAdvancedSearchResultSeoUrlPlugin cannot inherit from undefined class CoreAdvancedSearchSeoUrlPlugin
If I search for 1 word, the results appear ok, with two terms then there is a problem...
***Default Search Operator = or with SEO ***
/advanced_search_result/SearchTerm1?search_in_description=1
142 products
/advanced_search_result/SearchTerm1+SearchTerm2?search_in_description=1
0 products
***Default Search Operator = or with NO SEO ***
/index.php?main_page=advanced_search_result&search_in_description=1&keyword=SearchTerm1
142 products
/index.php?main_page=advanced_search_result&search_in_description=1&keyword=SearchTerm1+SearchTerm2
161 products
***Default Search Operator = and with SEO ***
/advanced_search_result/SearchTerm1?search_in_description=1
142 products
/advanced_search_result/SearchTerm1+SearchTerm2?search_in_description=1
0 products
***Default Search Operator = and with NO SEO ***
/index.php?main_page=advanced_search_result&search_in_description=1&keyword=SearchTerm1
142 products
/index.php?main_page=advanced_search_result&search_in_description=1&keyword=SearchTerm1+SearchTerm2
11 products