fnGetDisplayNodes() doesn't work w/ server-side tables?

indotnetdev

I'm trying to write a helper function that will work on both server-side and normal tables. I need to be able to get all the visible rows on the current page. I thought the fnGetDisplayNodes() plugin looked perfect, but it returns an empty array when I'm using it on server-side tables. I tried stepping into it. oSettings._iDisplayStart looks correct, the starting row based on the current page, but oSettings._iDisplayEnd is always 0, so the plugin never enters the loop.