Thread:Project:Support desk/UTF-8 converted to latin1 on output?

Hello, I'm encountering a really confusing issue. Article text seems to be being converted from UTF-8 to latin1 during rendering of the wiki text, causing multibyte characters to display incorrectly. This also affects system messages appearing as part of the wiki content area. It does not affect the sidebar.

This is most perfectly illustrated on the Mediawiki:Sidebar page, where the sidebar is displayed on the left correctly in UTF-8, but in the content area it is converted to latin1, thus creating garbage where the multibyte characters should be.

http://wikiausland.de/bookshop/MediaWiki:Sidebar.

It affects both new and old pages. Tables are all BINARY collation.

Does anyone have any idea what's occurring here and what I can do to fix it?