Thread:Project:Support desk/Image rendering not working; namespace prefix redirects to Special:Upload page

Hi all,

When I try to embed an image, whether one uploaded within Mediawiki or an external image, using the file namespace prefix, instead of rendering the image it links to the Special:Upload page with an additional &wpDestFile parameter with the URL of the image. I have both $wgWEnableUploads and $wgAllowExternalImages set to true in my LocalSettings.php file, which also contains a $wgFileExtensions parser with an appropriate array including the relevant image extensions. There is nothing else in my LocalSettings.php file that suggests a solution, problem, or even a clue.

This is a MediaWiki install that I am taking over, so I don't know what the previous admin has changed and am new to the CMS overall, so I don't really have any ideas on where to look. Has anybody experienced this before or have any suggestions? Many thanks!

Relevant version info:

MediaWiki -- 1.16.0 PHP -- 5.3.2 MySQL -- 5.1.41

Installed extensions: PdfExport -- 2.4.2 AuthDrupal