Thread:Project:Support desk/Run math.php with Mediawiki 1.23.1 under Windows/reply (5)

Maybe after the old 1.17 tables have been added and before the new 1.23 tables were added the charset of the database was changed? This would explain why there are different charsets inside the DB now. Or maybe the value of Manual:$wgDBTableOptions has been changed.

Anyway: There should only be one charset in the DB, MediaWiki prefers UTF-8.