Additionally, the merged images have disappeared from the original HDD location on the Desktop.
If the merged images have disappeared from the desktop then they must have disappeared before you exported the catalog. Are the merged images in the trash or recycle bin?
Is it possible that you didn't select the panorama when you did the Export as Catalog?
Is it possible that you have looked on the HD in the wrong folder for the panorama images? One of the most common mistakes we see is that people search in the folder they know the photos are in, yet through some mistake, Lightroom is actually using a copy of the photos in some other folder. Please do a search of the ALL of your hard disks, using your operating system's search feature, and search for this panorama by file name.
The panorama images are most likely in a collapsed stack.
Open the folder that the pano images should be in and from the "Photo" menu choose Stacking -> Expand all stacks (you can also right click on a photo in the library to do this.
Or you may have filter hiding them, so clear all filters too.
Thank you for the suggestions.....
Did a check by file name on the entire computer........ using the Windows explorer/file explorer......
Not hiding in the recycle bin ( haven't emptied that one in a long time, but not there)
Not hiding in some other than what I think folder
I did a un-stack without result.
Did a full removal of all filters.... no result.
Basically, still MIA
I have 44 of these missing..... and no other types of files are missing....
Did you go outside Lightroom to make the panoramas?
No. Used the Photo-Merge-Panorama function.
Do they come up in the original catalog if you search for the text string "-Pano" in "All Photographs"
When searching within LR, looking for pano :
No. the originals are still MIA.The previews are all there.....
The small previews do come up, with the warning that the originals are lost.... I need to find the originals.....
Not to seem negative or anything, but a few versions back, LR had the same problem and it was fixed..... I wonder if the bug got back inside the program and I was "lucky" enough to find it first....?
Thanks for the assistance .... I have examined each and every suggestion made without result. There is now only 1 choice.....
Remake the Panoramas, using the base files.... I have those
Copy the edits from the previews ( which still exist) onto the new panoramas created
Make some inevitable tweaks to each
Make sure the book images are correct for each panorama used....
Get on with life....