Mediawiki caching problem - Pages not updating after edit or login

Mediawiki has built in caching functions. This can sometimes conflict with browsers, and cause pages to not update after an edit has been made your a user has logged in. To resolve this issue disable the caching feature of Mediawiki. In the includes directory, of your Mediawiki installation, open DefaultSettings.php.

Change:

$wgCachePages = true;

to:

$wgCachePages = false;