I have a separate data drive in my system. When it filled up, I upgraded to a larger data drive. The person who set it up for me transferred all the dotage to the new drive. Now Lightproof can't find my main catalogue although for some reason my collections are listed.
Message was edited by moderator: fixed formatting and title, but not spelling
If you know where the catalog is located you can browse to that folder and double-click on the catalog. Lightroom will open the catalog and you can continue.