You don't want to keep reimporting if you have a copy of your files with the same structure on a new or differently-named drive (or in any case, really). It's is a simple matter to relink the top folder as explained her in figure 4: Adobe Lightroom - Find moved or missing files and folders ... View more

1. You could simply use snapshots, giving them meaningful names. But if you want to easily compare images with (that many!) different presets, I can't think of a better way than virtual copies. You could use stacking to reduce clutter. 2. The new virtual copy appears to the immediate right of the image copied. ... View more

To expand on what dj_paige​ said: you can move and rename folders in Lightroom (and in Lightroom only) without losing your development, but it's not the right way to organize your work. For this you want to use collections. You can put an image into one, or any number of collections and move them around at will, or remove them from a collection without losing your development. You can rename collections and reorganize them. A moment's thought will tell you the power of this: you can create a collection "Wedding Slideshow" of just the images you want in the slideshow - you aren't restricted by whatever your original folder arrangement is. (I agree with most who say to keep original/disk folders organized by date and nothing else.) ... View more

Amanda, the short course: RAW and jpg are two entirely different animals. The jpg already has a color-space and gamma curves applied; with the RAW that only happens in post-processing. What your settings apply to your RAW might be different than your jpg. This is almost certainly the cause of your differences. A good start would be to search RAWS vs jpg - others here might have a good first source to suggest. ... View more

I'd suspect maybe a different profile treatment in one than the other. As a quick test try resetting develop settings and see if the images look the same. Helps to narrow down problem. ... View more

I used to go from card-to-disk-to-Lightroom too, so it can't be that stupid 😉  And really, it should work fine that way. I'll still guess you had some source/target mismatch of sorts - but the way you're soing it now is simpler workflow as long as it's working for you. And while I hate to raise any red flags, I do want to note that if there were no mismatch, it could indicate file corruption, which could be a one-off, but also could mean drive or other strange corruption. ... View more

It's not clear what you did to make it work differently from what you usually do, so it's difficult to try to answer what is/was wrong. If they imported correctly from the card, I'd suggest that somehow there is a mismatch between the import source and where the files were actually located. ... View more

I assume there's a time zone issue relating to your camera: see this How to change the timezone in photo metadata? But if you sort your folder by capture time, it should take seconds, rather than hours to find the correct day division, and then a few more keystrokes to move the files into the previous day folder. There is no need to "try again" - I am not sure exactly what you're doing to try to correct this. ... View more

*IF* they are both shortcuts (small arrow on the icon), and *IF* each one opens Lightroom correctly for you, take one to the trash. ... View more

If you're importing directly into LR from your card reader or camera, one simple thing to try is copying one image first to computer. Then import in LR. If that fixes, then you have easily identified problem source as being in the chain. ... View more

Yes, unfortunately it's a sledgehammer approach that affects everything.  If you have to do this on many photos, perhaps you can fiddle with the orange and yellows to get a compromise solution that might not quite cure the discoloration, but give you the best of both worlds. Otherwise, I suspect using the localized solution of https://forums.adobe.com/people/Bob%20Somrak is your best bet. I'd also suggest trying any other color profiles you might have; one might help minimize the differences. And to speak to your original question, this "foldal" discoloration could possibly be a genetic thing, or a function of spray tanning! ... View more

Try unchecking "use graphics processor" in Preferences/performance ... View more

Are these camera raw images, or have they been camera "pre-processed" into jpgs using a scheme that might exaggerate skin tone differences poorly? Perhaps that and/or different light sources might account for some of the difference. Notice that yellow hue occurs in other tonal transition areas such as neck.  I was able to eliminate much of the difference by a some color adjustment HSL orange -56 -24 +29 yellow -58 -62 +40 - your mileage may vary. ... View more

View both images at 1:1 in Lightroom and you'll have a "true view" of any image differences. Compression is a weird beast - some images with large compression are "unnoticeable", while some images with a lot of fine definition show the compression clearly. This is a great article: Jeffrey Friedl's Blog » An Analysis of Lightroom JPEG Export Quality Settings   If you try saving the Lightroom at a given %, you can compare the exported filesizes to get an idea of what level LR is using for your 25mb compression. I just tried an image at LR 100% vs LR 70% and the 70% was bout a third the size with no sign of image change at 1:1, so my guess is you're fine. ... View more

First - if you were using Photoshop primarily as a printing aid, it's an extra step  - that, now that things are "broken", would be a good time to eliminate.  You should be able to print directly from Lightroom unless there's an additional need. I'm not familiar enough with the Canon Prograf software to help you here, but I want to suggest that eliminating Photoshop from your workflow might be good.  If you need a function of Photoshop, then your question needs to go to that group. Otherwise, maybe a Prograf user here can help you further. ... View more

"Mega-amounts" might not be quite routine. There just might not be quick ways to do certain things. I don't know the engineering of spotting, but I'm guessing it might be adjustment-dependent and thus incur multiplicative types of time/cpu costs. I wonder if turning off spotting while doing other adjustments might be a "workaround" of sorts. Otherwise,  maybe spotting, sharpening, at first, then roundtripping thru Photoshop? ... View more

Try importing a file to your computer first, and then into LR - if that works, it helps isolate the problem, and at least gives you a temporary workaround. If you can't import a file to your computer, it eliminates LR as the culprit. ... View more

I used panorama on  your two images and they stitched fine. Are you using that, or HDR merge? ... View more

dj, I could have been more clear - I wonder about the possibility that due to some other problem in her system, the difference in filesize would make a difference; say someting like a RAM or caching area issue. I don't know enough about the architecture of LR or a Mac to  know if that's a possibility; but now particularly because the import seems to be working with the card reader bypassed, why not try to  import and preview just one image? It does appear that one preview worked. Is the next image file perhaps corrupt? ... View more

In the other thread I wondered if this could be related to filesize. The fact that you can import now by moving files to HD certainly doesn't signal against this possibility. Are other programs shut down as you're attempting the LR maneuvers? Perhaps some Mac people here can suggest a good diagnostic utility to run.  And have you tried dealing with one image at a time? These are things to try, as well as having others test your images for corruption - but the fact that you've managed one good one makes image file corruption seem less likely. ... View more

You have two threads running, I'd suggest abandoning the other one as this has your latest reply.  If some Nikon images are working, it occurs to me that the culprit be filesize - are you using a card reader for import? That could be a choke point. If so, try copying some images onto your computer outside of Lightroom first, and then try importing directly from disk. ... View more

Have you been making the weekly backups Lightroom prompts you to? In that case, this: How to back up catalogs in Lightroom Classic CC (it says backup, but it is a link to restore). ... View more

You should  let people know your version of Lightroom when asking questions here, just in case a methodology changes. Having said that, Lightroom keeps all your photo development info in one catalog, and can import photos into different folders depending on your import settings: How to set file import preferences in Lightroom Classic CC   This can be confusing at first. The important thing is that unless you specify a new catalog (an advanced thing to do) all your images will be kept in the same catalog.. There is no old or new set, there is just one expanding set. When you're in Library mode, all imported images should be visible in the left panel "folders". It's often -not- a good idea to keep all your images in one folder. It usually makes more sense to keep them in folders arranged by date. You can use the collections section in the lefthand panel and create arrangements with wild abandon, noting that it is a "virtual" organizing scheme and that images will still remain in the same real folders. Click on the plus sign, create a collection, name it whatever you want, and drag images from folders into it.  I repeat, the real folder structure does not change when you do this. You can move images from one folder to another, but I'd recommend against it while getting your feet wet. Once you arrange images into collections (and after you have the hang of that, you can try collection sets) you can close the Folder window and forget about it awhile. One other thing that often needs to be said is that Lightroom doesn't touch your image files; instead, all the development and collection changes you make are stored in the catalog, separate from your images. That's sort of a beginners lesson and I hope it gets you on the right track. ... View more

I don't know whether there's been an indication of whether default off or default on. I say "off" - because hovering over causes lag problems for large files. As someone said, workflow shouldnt be disrupted because of a random mouseover. I realize this could make  some people miss the rich goodiness. How about a pop-up reminder (that can be turned off) telling people of the option?  Also, I can see that it's hard to open a new subset without hovering over presets. What if you allowed the option to "only preview on click"? That would highlight the setting and preview, then click-two (if applied) would select. ... View more

10,000 images isn't a real strain on Lightroom; at any rate, it's unlikely Lightroom deleted or removed them. It does seem possible they never got imported. If that is the case and you don't have a backup of them, you're out of luck. Another possibility is they got imported into some stray folder somewhere. That sounds dubious, as you've checked Lightroom, but I'd suggest searching your whole computer for the missing files, using either the file extension, or prefix. Search the trash, too, just in case. ... View more