I installed new folders, then decided I wanted to move them to become subfolders of another folder. Drag & drop (left-click) moved the folders to become subfolders, but left the folder icons in the old location as well. When I try to delete them, I get an error message saying the folder doesn't exist at that location. OK, it shouldn't, but why can't I/how do I delete the (old) folder icons? Yeah, I know, I should have used the right-click rather than the left, but stuff happens!