I am having problems with Lightroom 4 which does not seem to recognize my Seagate back up drive where all my images are on. Using my Apple Mac Mini I back up my images on 2 separate drives.
Under Catalog I have All Photographs / Quick Collection / Previous Import / AND Missing Photographs 1352 !! How can I retrieve these please?
They might not still be missing. That collection is created by the menu item Library/Find All Missing Photos. It doesn't get dynamically updated. Try running that menu command again and see if the collection disappears.