P: Moving files, resulted in deleting the files

yes. please invite me.

Sure I will volunteer as beta tester!

Good morning. We'd like to invite you to our prerelease if you're interested in evaluating a fix for this issue. Let us know and we'll get you added.

It's a separate issue. No files deleted in this case.

1. change to Library mode -> Grid view (press 'g')
2. select > 10 images
3. drag and drop images into any folder - notice the image that is highlighted!
4. error dialog "Error While Moving Files" is displayed that the highlighted image was unable to be moved - see screenshot #2
5. manually drag and drop last file into folder :(

This is not 100% reproducible but on my current system (i7, SSD, 12gb RAM) when sorting panoramas into sub-directories, I get this error about 75% of the time. Also on my old system (AMD Phenom x4 w/ 6gb RAM) I would get this error even more frequently.

Win7 x64. Lightroom v3.4.1 (however this bug has been around since at least v2).

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Very good.  This has been a long-standing issue very hard to nail down, and perhaps this is a source of most or all of the reports over the years.

Using your instructions and test files, John, I was able to duplicate this issue.  A bug has been filed against this thread. 

Thanks to you and Dominik for the instructions. 

Dominik Busch has identified at least one cause of errors moving folders: Selecting a folder and its contained subfolders and dragging all of them to a new location can cause LR to get confused, moving the subfolders into wrong locations and reporting spurious errors.  To reproduce on OS X:

1. Download and unzip this folder: https://dl.dropboxusercontent.com/u/21811200/LRmovebug.2017.03.20.zip

2. Place the unzipped folder "LR move bug.2017.03.20" on your Desktop.

3. Start Terminal and execute these commands:

cd ~/Desktop/LR\ move\ bug.2017.03.20
sh build.sh ~/Desktop/root 5 5 3

This will create a nested folder tree containing 125 copies of a 44 MB DNG.

4. In LR, import the folder ~/Desktop/root using the Add option.

5. On an external drive, create a folder "dest", add a dummy pic to it, and import "dest" into LR using the Add option.  Then, delete the dummy pic from the catalog and disk.

6. In the LR Folder panel, option-click the triangle next to "root" to expand the tree completely. Then select "root" and all the nested folders:



7. Click and drag "root" to "dest".

8. A number of spurious errors will be reported that look similar to:





9. All the files got copied, but the folder structure was scrambled:

To be precise, the folder structure remained intact, just the images were lost.

I have a theory what might have caused this:

When I dragged the folders, one level of subfolders was still expanded. I simply highlighted the containing folders plus all the subfolders and dragged everything to the new location. I did so because I was lazy, the folders happened to be still expanded from what I had done before.

This might lead to conflicting tasks within Lighroom when it tries to move a folder and a contained folder within at the same time. The top level folder tries to move the sub-level since it belongs to it, but the sub-level folder has been highlighted additionally and also tries to move.

Perhaps one of the LR-Gurus could look into that?

The same just happened to me. I moved 11 folders, each containing subfolders up to two levels. All the folders/subfolders contained images.

Two folders with subfolders were lost, totalling in 216+128=344 lost images.

I am extremely annoyed that a function offered in Lightroom can have such disastrous consequences. My LR version is 2015.8, OS is 10.11.5. Conventional HD connected via ESATA.