I have just wasted several hours trying to get images to display in my wiki. I could upload images fine using the “Upload file” page from the Toolbox. I could place images in a page an they showed up fine in preview, but when I saved the page, the images did not render, instead the contents of the File tag showed e.g. File:test.png Finally I found a post on mwusers.com that helped. For some bizarre reason, commenting out the $wgUploadPath in LocalSettings.php fixes the problem. Who knows why?