Last modified: 2007-12-13 12:15:24 UTC
Please check the status of the picturepopup extension in the config files.
As far as I know it is not really enabled as the extension is unready but you can see its messages under [[Special:Allmessages]]: [[MediaWiki:picturepopup_invalid_icon]] and following.
It's a little bit confusing.
Seems to be enabled...? I'm not sure what you want checked? Can you describe what's wrong?
Extensions was removed from SVN in r28434. Should be removed from WMF configs asap to avoid issues.
*** This bug has been marked as a duplicate of bug 12288 ***