P: Cannot merge panorama after updating to 10.14.6

Carlos, I will look into that, thanks! I've never had any issues with Time Machine backups / restores in the past, but you've opened my eyes to something new. Appreciate it.

I wouldn’t do that, Time Machine is flaky! Don’t rely on it to keep your data safe, use Carbon Copy Cloner.

...btw, I have also tried converting the bracketed shots to HDR prior to attempting to create the panorama (in this case, creating 5 DNG's from the 5x3 Brackets). The "HDR" DNG files will create (although, anecdotally, slower than I'd expect them to), but the panorama will not create from those 5 files either.

Thank you for your input here Victoria. Yep that's what I saw, maxed CPU for around an hour (and very hot laptop) and stuck at around 40% ish, on a file set that I know in the past would have taken only a couple of minutes to process. Unfortunately, I don't have a Mac Pro to hand 🙂 

Hi Victoria, it seems you are seeing exactly what I'm seeing. Before the last few days, to merge around 15 HDR Pano Shots (yes it's an HDR Pano) from the drone in the past I'm used to it taking around 3 mins max on my MacBook pro. The Sony shots take longer, but they are bigger files. I've previously merged 70 shots from the Sony on this MacBook and it took around 20 minutes.

Hi Rikk, they are the native files from the drone. I imported them but did not convert them. 

has anyone tried the 10.15 beta? Does it work there?

forget about clearing the caches. Even on a fresh system it does not work.

If LR shows the beach ball when you try to work on while creating the HDR or pano then yes, that's what we see. In this case it's also not possible to quit LR in a regular way. Try to export a dng as tif - does it work? Here it took a week ago 20-30 seconds to merge 5 shots of my 5Ds to one HDR. Now it takes 15-20 minutes.

It's still at the same point after an hour. I've just tried it on Paul's Mac Pro and it was done in about 20 seconds.