Thread:Project:Support desk/Mediawiki 1.21.1 upgrade issue./reply (5)

Ohh, I thought the lines, which you posted, would come from the Apache log. But they don't?

MediaWiki should also work with PHP 5.4. So if you suspect PHP 5.3 to be the culprit, maybe you can switch the domain to PHP 5.4 and see, if that helps.

.htaccess is kind of an Apache configuration file. So maybe it is possible to cause such an error there. You could try trimming down .htaccess to the lines, which are absolutely needed - maybe it also works without any .htaccess file, but I am not sure about that...