GitWiki lost ability to parse macros

Somehow, the GitWiki (which is MoinMoin wiki) lost the ability to parse
macros. Macros are now output as is, instead of being substitutes with
their expansion. It looks like MediaWiki-like syntax plugin got broken,
because besides of {{macroname}} not being expanded, additionally pipe
links [[target|label]] are not parsed.

See for example
  http://git.or.cz/gitwiki/RecentChanges
  http://git.or.cz/gitwiki/FindPage
  http://git.or.cz/gitwiki/SystemInfo

  http://git.or.cz/gitwiki/InterfacesFrontendsAndTools 
  (table of contents lost)

So anyone has idea what has happened, and how to repair it?
-- 
Jakub Narebski
Warsaw, Poland
ShadeHawk on #git