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 "é":
'author' => 'Stephane Brunner'
Now I can again see my Special:Version page! :)