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Develop module Thumbnails disappear after Merge > HDR operation

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PhilBurton

Lightroom enthusiast (and still learning)
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Lightroom Version
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Operating System:Windows 10
Exact Lightroom Version (Help menu > System Info):7.1

After doing my first HDR operation (from NEFs), one of the source files doesn't display in the Library grid view. I tried to re-import the missing image, but Lightroom won't do that since I have LR configured not to re-import duplicates. If I inspect the Windows folder where the missing thumbnail file is stored, I can see the original NEF file.

First, I did an HDR involving 3 NEFs, then a second involving only two of those NEFs. Lightroom shows a thumbnail only for the second HDR, but the actual DNG file for that first HDR is clearly in the Windows folder.

So what do I do to display the missing thumbnails?

Phil
 
is there a filter of some sort applied, or a sort order ?
what do you see if you go to the folder in LR ?
 
Are the images stacked? I believe there is a bug in 7.1, but I'm not entirely sure. Do a search on feedback.photoshop.com
 
is there a filter of some sort applied, or a sort order ?
what do you see if you go to the folder in LR ?
In the Windows folder, I can see the NEFs for the thumbnails that are missing. There are no filters on the grid view in LIBRARY.
 
Are the images stacked? I believe there is a bug in 7.1, but I'm not entirely sure. Do a search on feedback.photoshop.com
The images were stacked so that I could better organize this shoot. But if I remember correctly, I unstacked the group in question before doing the HDR operations.

I did a search on feedback.photoshop.com and didn't find any other posts with this issue, so I started a new thread.
 
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