I quit an import process on my Power Pro mac running Lion and LR4 froze.
I power quit LR and a window appeared with Adobe saying there had been an issue with the transfer and that it would be reported.
Now, when I open LR4, there are none of my folders or photos showing (0 photos instead).
I do have two back ups and off site.
How do I best reacquaint LR with my Catalog and folders?
Many thanks in advance.
Open Lightroom, check under File->Open Recent for your actual catalog file. If it's not there, restore a recent backup.