Thread:Project:Support desk/Characters displaying incorrectly/reply

The page titles appear double encoded. (For example before where you had ó - which has the binary representation 0xC3B3, you now have unicode character number C3 (Ã) followed by unicode character number B3(³). This appears to be present in artricle titles but not the articles themselves.

I'm not sure how this could happen from just upgrading MediaWiki. Did you do any other upgrades at the same time or change anything else? (For example switch database servers, upgrade database servers, re-import the db from a back up, change the character encoding on any of the fields in the database, change anything in LocalSettings.php (especially the $wgDBmysql5 setting)).