I have the same problem.
Articles not archived are displayed well, but after moving to archive SEF links (made by Joomla embedded mechanism) are broken.
This is problem in 90% related to Joomfish, because on other site with no Joomfish everthing works fine (Jommla! SEF + archive module).
One strange thing is, last SEF URL segment, this one with .html suffix, is after wrong (first on section / category list) category segment , regardless of section that it belongs to.
English is default site language.
It looks like "last good seen" section / category segment, when I switch to archive from non broken SEF URL (non archived article) this segment is then not "first of section / category list" anymore but inherited from previous address.
$life_site variable is set properly in configuration.phpEnvinronment
SEF Extension - Joomla! build in
PHP Built on: Linux s26.ehost.pl 2.6.18-92.1.10.el5PAE #1 SMP Tue Aug 5 08:14:05 EDT 2008 i686
Database Version: 4.1.22-standard-log
Database Collation: utf8_general_ci
PHP Version: 5.2.12
Web Server: Apache
Web Server to PHP interface: cgi-fcgi
Joomla! Version: Joomla! 1.5.15 Stable [ Wojmamni Ama Mamni ] 05-November-2009 04:00 GMT
User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; pl-PL; rv:126.96.36.199) Gecko/20100401 Firefox/3.6.3 Error
404 - Resource not found
You may not be able to visit this page because of:
1. an out-of-date bookmark/favourite
2. a search engine that has an out-of-date listing for this site
3. a mistyped address
4. you have no access to this page
5. The requested resource was not found.
6. An error has occurred while processing your request.
Please try one of the following pages:
* Home Page
If difficulties persist, please contact the System Administrator of this site.
Resource not found