Extension talk:IssueTracker

I've followed the installation instructions and when I add to a page I get a very long string that starts with: "@ENCODED@PHN0eWxlIHR5cGU9InRleHQvY3NzIj4NCmRpdiNpc3N1ZUZpb"

This is with MediaWiki 1.11.0 and PHP 5.2.5