I see an archives section right below your search section. They're hard to read because of the background, but they're there.

No, not that (but that reminds me that I have to fix b2evo in FF). What I'm talking about is if you click on the "more" link it should take me to the other, older archives. Instead, it takes me to an empty page.

You have the _arcdir.php file in your custom folder. Compare your /custom/_main.php file to a skin that does work and look for the section that starts with

switch ($disp) {

Make sure the section for arcdir is there.

thx!