Okay, here is a bit more info. This happens when reading from a card. I have not seen it happen when reading from files stored on my computer hard drive. I am using SanDisc 32G Extreme Cards and SanDisc 16G Extreme Pro cards. I have two card readers - both USB 3.0 models - and both do this.
I have never touched the cache so it is factory default. Honestly, not even sure where to look for that.
I always eject the image card before unmounting and wait for the icon to disappear from the screen. PM opens a new contact sheet whenever I insert a new card. All I meant by "enlarged" is when I click on an image to enlarge it from the contact sheet. The images are not zoomed. I scroll through images like this a times and PM drops images - meaning there are images on the contact sheet view that are not showing up when I scroll through images at full size viewing.
Attached is the screen shot. I have the sort set to Capture Time. The images at the top of the sheet should be displaying at the end of the football shoot. The images of the people and the images of the tables are from two different assignments shot on different days and they are intermixed with the football pictures. I have also tried using the Filename for a sort option and the situation does not improve.
This has been happening for about two, maybe three weeks and the problem seems to be getting worse. I have reformatted my cards multiple times during this time frame and even a first assignment after reformatting can come up with out of order images. To be clear, the only thing that seems to have changed is the PM update. I have used these cards and card readers before the update without this problem. I wish I could give you a specific time when I last updated PM but, unfortunately, my memory is not that good.