On the Adobe Forum, I asked: If I let my retail LR5 access my LR4 Catalog, will it retain the develop history states from the left-hand pane? I often want to return to an image and undo a few of the latest adjustments but not all, so it will be a disaster if the history isn't transferred to the converted catalog. A very quick reply from an experienced user assured me all would be well. It wasn't. As you can, an extensive history of adjustments has vanished. I can revert to the original raw state but not step back in a linear fashion to undo the last five adjustments for example. I'm pretty sure this is because the record of adjustments isn't in the catalog which is just a library, but in a sidecar file or xmp file. But All I did was ask LR5 to import my LR4 catalog. Should I have used a different method? Maybe create a new catalog then import all my folders and images???