Thread:Project:Support desk/Cannot get the top/lef logo replaced/reply

Are you using 1.12 because it's from a package? That version is old and out of support (including security fixes). Packages can be insane enough to have several copies of LocalSettings (including symlinks), you might have edited the wrong one. Our overall recommendation is never to use packaged MediaWiki because we MediaWiki developers are yet to see a single package that is not broken.