I upgraded from MediaWiki 1.23 to 1.24.2, but at the end of the upgrade, the pages started to show a strange string, by instance - "COS" at the top of the pages. I tried to inspect the page code to see if there was anything strange, but the three letters doesn't appear on the code.

  • Those 3 letters certainly appear in the HTML source code. Are your source files encoded OK? Encoded BOM??
    – MrWhite
    May 21 '15 at 18:39
  • It does appear in the source code... May 21 '15 at 19:46
  • Did you remove the entire MediaWiki directory before putting the newly downloaded code in place? If not, how did you make sure your installation was not cracked?
    – Nemo
    Jul 18 '15 at 20:56

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