I wanted to remove permission only to one library, but due to my lack of knowladge I deleted permission to whole group of user. When I reasigned permission they can still can't log in to home page. They do have permission to the other sites but have "access denied" erorr in mian page. How can I fix it? I simply removed user permision from one library and it had impact on whole SP site. And when I had restored it users can't log in into ghome page.