Thread:Project:Support desk/Uploads just... not working./reply

If it just refreshes back to the upload page, without any error message (missing file, etc), then the problem is that the POST data is lost when MediaWiki is trying to handle the upload.

This can happen if your configured $wgServer is different from the actual server name and your webserver is performing a redirect (for example, it redirects example.com to www.example.com, and $wgServer is set to example.com), because the POST data is lost on the redirect.