Bob
Thanks for the advice. I've tried your second suggestion to fix the catalog, that hasn't changed anything. I'd prefer not to have to create a new catalog from scratch as my experience - and that of others I know - is that will take a very long time. My attempt to fix the catalog took half an hour, including breakfast.
I followed your instructions:
1 - Forget option on the Catalog Management page.
2 - Locate Existing Catalog option and select the same catalog again.
3 - Run the Reintegrate Forgotten Catalog utility in the Maintenance section.
4 - Display all images in the catalog. (Go to the Organizer panel's Search Tab. In the Quick Search field, just enter a period and then hit Return).
5 - In the Edit menu's Select Catalog Status, select the Source File Unavailable option. This should select all of the offline images.
6 - Right click any of the selected images and choose the Remove from Catalog option.
There are no selected images.
To me this is because my ~/Pictures/Camera Dump folder is on-line and always will be. So browsing to that folder using the Browse tab shows the images as on-line. Remember these are images which do not exist in that folder.
So no further on other than having the nuclear option.
To help minimize these problems in the future, I recommend waiting until your images are in their final destination folder on your archive drive, before including them in the catalog.
Sound advice. I think the problem stems from having done a full catalog sync which would have added those files when they were in that folder. My expectation - and tell me if this is wrong and or unreasonable - is that the next time I synced the catalog PM+ would see those files are no longer in that folder and mark them as 'missing'. Why isn't that happening?
Thanks