Thread:Project:Support desk/my custom skin disappeared after upgrade to 1.20/reply (18)

When you overwrote the old files with the new ones during upgrading, you might still have old unneeded files in your wiki folder. If you want to start the skin over new, you should take the skin files out of the tar archive, which contains the source code of the new MediaWiki version. If you instead put the new skin files into a new, empty folder, then the skin should not be poluted by unneeded bogus files.