Could you please check and confirm the version of Lightroom you are using?
Please post screenshot of the Lightroom interface.
Have you made any changes in the folder structure?
Are you able to see '?' on the folder names in the Library module in the Folders panel?
That didn't work quite well. Reason for that is that some files are renamed, e.g. in some case i just see a date and time as the filename, in other case i see the filename together with a longnumber.
Looks to me as a corrupt catalogue.
Is a solution to try to install an older version of lightroom?
It might be good to see a detailed screen shot of this, including your Folders panel.
Screenshot of filenames with a long number:..00.29.20.png
Screenshot of filenames, existing just in date and time. The original
filename has disappeared. ..00.30.14.png
2015-11-20 0:16 GMT+01:00 ManiacJoe <firstname.lastname@example.org>:
missing photos created by ManiacJoe
<https://forums.adobe.com/people/ManiacJoe> in Photoshop Lightroom - View
the full discussion <https://forums.adobe.com/message/8195825#8195825>
Attachments need to be done at the website; via email does not work.
Those file names look like something a picture hosting site would generate.
Just to clear things. The original filename is not altered. It's just something in the program / catalog Lightroom CC.