Why has my image disappeared in the LR5 Library module. I right clicked the image, selected Metadata and "Read metadata from file" clicked and the image is no longer in the catalogue/folder.
Make sure that Library > Enable Filters is unchecked, and in the left-hand Catalog pane select All Photographs. Then look for your photo. It may be that you had a filter or smart collection that originally matched the photo, but when you re-read the metadata from the file, the photo no longer matched the criteria.