Further to my previous question on the subject, it seems that it is normal for non-RAW images, edited via "Edit in Photoshop", using the "Edit Original" option and then saved as another version (e.g. a Jpeg to a different folder), not to automatically be placed into the Catalog. In other words, one has to manually import them back into Lightroom. Is there a good reason for this? I can't think of one!