Files disappear from catalogue, not visible to import module

I also had/have no specific sort order. For now, this is resolved, it has been working flawlessly after physically removing and rebuilding the files.

I can sense quite a bit of - understandable - frustration ​@dj_paige - I should have described the issue more in depth, so it didn’t read like “hey, I installed LR yesterday and I have a problem” - I was in a rush to get a solution while being in the next shoot. And yes, I HAVE inadvertedly pressed keyboard shortcuts before, and since LR is the only software I learned using without those, it is very well possible I just don’t know enough to count as a “safe” person to ask questions here.

Thanks for taking the time ​@dj_paige & ​@JohanElzenga 

SOmetimes, the sort order in LrC causes this to happen, if for example, the folder is sorted by the date of the last edit. In this case, the photo becomes the first (or last) photo in the sequence. 

Change the sort order in LrC to Capture Time or File Name.

Most likely you have an active filter that filters them out when you make a certain adjustment. Example: because you add labels and flags, you may be filtering on ‘no color label’ and/or ‘no flag’, so you only see the images that still need to be worked on. But that means an image will disappear from view (not from the catalog!) when you have added a color label and a flag.

During the same session, these files disappear from LRC.

Importing is never the solution to fix problems. This is so important, I am going to say it in big bold capital letters. IMPORTING IS NEVER THE SOLUTION TO FIX PROBLEMS.

A possibility is if you are using a Smart Collection, sometimes if you edit the files they no longer appear in the Smart Collection, this would be expected behavior of some Smart Collections (not all Smart Collections). If that’s what happens, then probably you shouldn’t be doing this editing in a Smart Collection. You can always find your photos in “All Photographs” or the appropriate folder in the Folder Panel.

If that’s not it, please describe the problem in a lot more detail, and show us screen captures of the entire LrC screen before and after the “disappearance”.