Lightroom: Panorama Merge Stuck at 100%

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  • Updated 3 days ago
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I have a set of pictures to be stitched to a panorama. I have taken each shot in 3 different exposures, so I have a total of 18 pictures. I first tried the HDR Panorama Merge on these 18 RAW photos, but the process was taking too long. So I did HDR Merge on each of the 6 different shots and from these 6 HDR images, I planned to do a Panorama Merge. However, when the progress bar is always stuck at 100% on Gathering Data, not giving me the preview.

I have tried restarting Lightroom and my desktop but to no avail. I am using iMac (Late-2015). macOS Mojave, Processor 2.8GHz Intel Core i5, 8GB 1867 MHz DDR3.

Not to mention my iMac lags significantly while Lightroom is open. I usually have Google Chrome, Spotify and WhatsApp running in the background but to my knowledge, these are not heavy on processes.
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Pek Jun Rong

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Posted 4 weeks ago

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Rikk Flohr, Official Rep

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Please go to Help>System Info... in Lightroom and get us your current installed version number please. 
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Pek Jun Rong

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Lightroom CC version: 2.2.1 [ 20190312-1546-e438717 ] (Mar 13 2019)
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Rikk Flohr, Official Rep

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Thanks Pek,

When you did the joint HDR/Pano Merge, you said it was 'taking so long' that you tried the other. Would it ever actually complete if you left it alone?
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Pek Jun Rong

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I left it alone for 2 hours, stuck at Gathering Data 100%
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Rikk Flohr, Official Rep

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Ok.  If I read this correctly, HDR works, Pano fails (using HDR Results), HDR/Pano Fails.

What happens if you take the 6 normal exposures and don't worry about HDR for now. Will those stitch into a Pano?
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Pek Jun Rong

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Yes, it does work, although taking 1 hour to merge. Is that normal?
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Rikk Flohr, Official Rep

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What is the Camera used here?
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Pek Jun Rong

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Canon EOS 80D with EF-S 18-135mm f/3.5-5.6 IS USM kit lens
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Rikk Flohr, Official Rep

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Given your specs, I would expect a time less than two minutes for a merge of 3 Canon 80D files. 

What is the free space on your drive?
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Pek Jun Rong

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My cloud drive doesn't have free space now
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Rikk Flohr, Official Rep

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That may be the issue.  Can you free up some space on that drive?
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Does this happen with all sets of panoramas, or only this set? If it's set specific, can you post a link to your set of files for us to troubleshoot with?
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Pek Jun Rong

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Not just this set. I'm also not able to get the link because Lightroom CC is taking forever to generate the URL for me
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Kirill Konshin

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I have the same issue with version 2.3. It was merging fine when my library was ~100 pictures, but now when I uploaded the rest of ~4000 images it stopped working.
In my case it is stuck on "Gathering Data... 100%".
(Edited)
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Rikk Flohr, Official Rep

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I am sorry to hear that the 2.3 update didn't fix the issue for you. At this point, we would need to get a few sample files from you that fail so that we can test with your files. Are you willing to share files with us?