Thread:Project:Support desk/ is not working on my Mediawiki install

The magic word is not working on my Mediawiki install; it simply appears as text on the page in which it is used. I am using version 1.21.1 of Mediawiki. I have seen two suggestions for solving this problem that have not helped.

The first is to use $htEditTabLink = false; I'm not sure what that does but when applied in my localsettings.php it doesn't help. The second I have seen is to upgrade the Mediwiki install; the cases I have seen are users with 1.18 or so and the suggestions is 1.20 or higher which I have.

My page is here where you can see the error and the error can be seen at the top:

http://wiki.tankpedia.org/Tankpedia:Picture_of_the_day/October_2013