Hi Scott,
I got things configured so there should be a public facing copy for demonstrative purposes. This site isn't ready to be indexed yet so I don't want to paste the URL directly... test[DOT]abc-clio[DOT]com/Praeger.aspx
The page above is one of our imprint pages. On the left there is a search products tab that you can click on to access the search form. On the form there are 2 search buttons. The advanced search button is connected to a page that has the problem, the quicksearch is connected to a page that does not have the problem.
If you submit an advanced search (Title="war"), you will see that the search results page is blank. From this blank page, attempt to submit another advanced search and you will see it once again appears empty. Now, click on the address bar, hit enter to reload the page... you will now see the full Praeger title list. Attempt another advanced search, you should get results.
This shows that if the page is initially loaded without a post back/search submit, everything works but when the post back is from another page, there's a problem.
Hopefully this helps clarify the behavior.