I am trialling Lightroom 4 but when I import the files I can't see the thumbnails in the preview window, When I double click I canm't see the photo either. Not a great start - how am I going to go with the more complicated things!!
What camera? What files?
Sent from phone.
Nikon D90 and both the raw files and JPEGs - interestingly I am trialling the photoshop elements and can see the photos
Fixed - found instructions on another internet page