I broke backwards compatibility in 0.52. Recently customized templates like the editform may refer to wikipage_template().macros['head']? which is missing. The latest version of skins/zwiki_standard/head.pt in CodeRepos has the fix. Here is the fixed head.pt which will restore backwards compatibility; or you can delete/recustomize your editform.
fixed for 0.52.1 --simon, Sat, 08 Apr 2006 12:58:19 -0700 reply
Status: open => closed