I get a hard hang on my web browser when I click on the   Use Archive Database  link.
This is with both IE6 and Firefox and for both V1.2.5 & 1.2.6.
I've isolated the problem to these statements on lines 80 and 86 (V1.2.6) in base_main.php
    header("Location: ". $BASE_urlpath . "/base_main.php");
If these lines are commented out, then the   Use Archive Database  link now works for me.
Anyone have a clue as to why?