I've just upgraded the Wiki software to the latest version.
Please post here if you have an wiki problems.
The SMF/MediaWiki integration may play up a bit.
Also, the wiki will look a bit different. The old skin that was being used is no longer supported. I've installed the new version of the same skin but it does look a bit different.
I know about the image "error" on the top left of the page - I'll sort this soon but it doesn't affect the functionality.