Thread:Project:Support desk/Upgraded 1.19 to 1.23, Main Page not found/reply

First: If you upgraded a dtabase, make sure that it no longer gets used by an older MediaWiki version. Using it wth an older version can (will?!) create wrong entries, which will only cause trouble!

As for the "Main_Page not found" issue, I can only guess:

From seeing the URL fragment "/Main_Page" I guess that you had short URLs set up, right? This is usually done in the .htaccess file. Have you moved this file to the according new location? I think that currently just the redirect to index.php is no longer happening. With other word: You still can access your-domain/index.php?title=Main_Page and it shows you a wiki page. Is that right?