I'm using Lightroom version 4.4. After copying my LR catalogue + all original fotos on the harddisc of a new PC, lightroom does not recognize fotos as duplicates, when I try to import new pictures from a flash card.
I have ticked the checkbox 'do not import duplicates'. All fotos of the flashcard (new ones + already existing ones in the lightroom catalogue) appear as 'new'.
For sure it has to do with the copying of the lightroom catalogue, as it's always been working fine in the past and duplicates were all recognized.