After installation of MediaFunctions on my MediaWiki 1.9.3 I couldn't display Version-SpecialPage.
I comment out the "wgExtensionCredits" and it works. So I found the solution:
In line 34 at definition of "
$wgExtensionCredits['parserhook']" you find the name of the author. There is an accent above the "e"! So I wrote an simple "
e" instead of "
'author' => 'Stephane Brunner'
Now I can again see my Special:Version page! :)