Nice guess at the third party app!! Looking at my confusing old code, I don't think the query/search needs to change. You just have to pass in _next_page_id from the previous query in as _page_id in the new query. I'm not 100% on that as I haven't looked at this code in several months and there's a reason I wanted to get away from having to manually do the paging. It really could benefit from an OOP approach, and I was hoping there was a module that already handled it.