Lightroom 15.3 Merge to HDR not working properly

Question

Merge to HDR in LrC 15.3 is stalling (beach ball) or not responding.  I frequently merge HDR images for Real Estate photos and today, after updating to LrC 15.3 I had to Force Quit from LrC multiple times to regain control of LrC.  I stacked my bracketed shots and used CTRL+H to merge.  LrC did process a couple before stalling.  After multiple attempts resulting in Force Closing, I tried using the menu commands, no change.  I then uninstalled 15.3 and reinstalled a fresh copy of 15.3 and the HDR problem continued.  Finally I uninstalled 15.3 and downgraded to 15.2.1 and the Merge to HDR function worked as expected.

John_Gerard · Answer

I use a Canon EOS R5 shooting in RAW. 3 bracketed shots -2, 0, +2. I also use a DJI Mavic 4 Pro in RAW. 5 bracketed shots. I experienced issues with stacks from both cameras. I’m shooting for real estate and this process has worked extremely well for years using the same canon camera and my previous DJI Air3 drone. My typical workflow is to import all images from both cameras, auto-stack by time, verify the stacks, Select all stacks and hit CMD+H to allow LrC to process all of the images to HDR. It generally take 20-30 minutes. This was a smaller job and as I ran into issues I started selecting only a single stack, then opening the stack and selecting the individual images. I even tried to open in Photoshop and Merge to HDR (from the menu) but LrC still stalled on that, very different, workflow.

With LrC 15.2.1 reinstalled I started with single stacks but finished up by selecting all remaining stacks, about 8, and all HDR images were processed and stacked as expected.

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