KiCad started using lock files to prevent having the same KiCad project open in two KiCad instances at the same time, and those lock files are not deleted when KiCad crashes. You can just delete these lock files
KiCad started using lock files to prevent having the same KiCad project open in two KiCad instances at the same time, and those lock files are not deleted when KiCad crashes. You can just delete these lock files