itunes on macosx- itunes library EMPTY!!!

I installed LW 2 days ago. Since each time I shut my macbook down when I restart Itunes gives a message that says "the iTunes library has been found to be invalid a new library is being opened named iTunes Library (damaged)"
there are no files in this library whatsoever, whether from my CDs, purchased from iTunes, or from LW. I can go to "Add to Library" and all of the files are still there, and they will import back into my iTunes library (of course needing names fixed again, etc) but they will not be there the next time I restart my computer.

does anyone know what's going on?

Thanks!
Wonderwillow

I'm not sure whether it's OSX or iTunes updates that have really mucked permissions up for iTunes. I also had a major issue. In the end having to create a new account & copying the files into iTunes to store into a new location.
I think it may be a folder permissions issue. Select the iTunes Music Library folder & see who is owner. Make sure the iTunes Music Library ownership is same as its parent folder & make sure it is owned by you or the system. I think it needs to be you not sure.

In my scenario I couldn't open iTunes at all, it would immediately come up with invalid location message or something similar & then close down.