i used to had that problem also .. i found it out myself when you use a pen tool or line tool , you just click on the tool itself again and then press right click on your document ( your sig xD ) and then you can select Delete Path .. or what i always do is make my selection with the pentool and then right click and then Make Selection and then fill it in or make a line and then press CTRL+D and tada hope that helped you
I did what you said but once i click the tool again and right click the sig there is no option called 'delete path' the only ones that are black are: "define custom shape, make selection, stroke path, free transform path" remember im working with the line tool Edit: never found it. I clicked the pen tool and right clicked the sig. Thanks