When i updated from 1.83 (b) to newest spip, i was told to let all files stay in the folder, and just update with the new version of spip..
and it allmost worked..
unfortunately, a index.php3 stayed in the folder a breve+breve-dist.html stayed in the folder, and maybe a few more !?
ever since have i been having problems..
the spip part of my site did work, then it stopped work allways with the same problem "prefix" www was needed, or didnt work.. ( have 4-5 CMS ekstra in the same site.. they all worked witout prefix ?!( site/other_cms)( so I blamed spip!?)
after deleting those old spip files and the cache it works again..
dont know if the cache was the problem or the files, but I think the explanation about how to upgrade need a few words bout deleting the old files that is not being "writen over"
hope that my "problems" help other if they have problems updating..
Kindly
Tom