3ds max 2012: material library import issue

[Boris Horosavin]

guys, i'm having this, like, enormous problem with max 2012. once in a while i import materials from some of my older scenes and projects, just to save time and trouble, and i never save changes i've made to material library. now, for some reason, at some point these scenes that i import materials from tend to get corrupted - i can't open them, nor can i import materials, objects ore any data from them at all . they are utterly destryed. and this had happened several times already, so i'm sure it is not just my imagination.

does anybody have any information on this matter and is there solution for this problem.

thanks