Page two of results 'forgets' all search criteria!

Issue Summary

I have a large site, so I'm testing trip_search against almost 50,000 nodes.

I searched for the word budweiser, in the category "drinks", between the 1 January 2006 and the 31 Dec 2007 and get 38 results returned (randomly hopping between 2006 posts and 2007 post which is also an issue that needs fixing - ordering results by most recently posted first is universal).

However, when I click on page 2 to see the rest of my results, I suddenly have 459 results, and at the top of this page posts from 1998, 2001 and 2004 appear. It's like trip_search forgot all my criteria from one page to the next.

You can try it yourselves if you want.