My apologies flash. Of course the LR4Beta catalogue will open in LR4. What I was trying to say is that since LR3 catalogues will not open in LR4Beta when LR4 is released if you have been using individual images in LR4Beta that are also in your LR3 catalogue or importing from your LR3 catalogue you will end up with duplicates of the images in question. Which, if not a huge problem, is a little untidy.