My KiCad version is: "KiCad 4.0.6"
Brief History may help you to locate the trouble:-
I switched over to KiCad from Eagle, only a month or so back. But still, I have made two PCB's in KiCad since then, with the (PCB new) with full copper pour & I even converted pcb design to a PDF file. Then I got the PDF design printed on glossy "Toner Paper" via a Laser printer, and then transferred the pcb design on a copper clad board, & using a heated electric iron, and so I made about two PCB's at home, which I also assembled and are working fine.
But, the problem started, now, after I had made a "new local library", and put my new created component in it. And this, my new component, also was seen in the component device library. Then I also make my own new relay "foot-print" & put it in the footprint library. I could also see it there with its 3D view etc. very nicely, & also edited it to a few times, to make it perfect.
But then, after all this success, the "cvpcb" started mis-behaving, and not opening & causing the KiCad.exe to hang (not respond) - this message started coming often. Twice I also "uninstalled" KiCad" and all my project KiCad files were also deleted. KiCad was down loaded again fresh, same version 4.0.6,
Because once, the error had showed "my new library" name, as an error.in the list of errors. So I thought that I must Uninstall and again download KiCad, which will set the KiCad library as it was at default, and my error giving library will be removed from KiCad.
But to my horror and amazement,.. I still found my "new created component" very much there in the component library...! Only my new "footprint" was not found again in the footprint library.
But after even this, once I fiddled with the "path dialogue box" on the launcher window under preferences, and then, also did something on the eeschema by clicking the paths under the dialogue box that comes after "preferences", and I clicked "REMOVE" button there.
Then, after this, my "cvpcb" again worked (though it took 3 minutes to load my list). But I am not sure what I really did in those 2-dialogue boxes as given above. So I am not sure what to exactly to do next time when this problem comes back?
So in light of the above actions, please help Sir.