Drag from where? Drag to where?
What happens, what do you see or not see on your screen that says it can't be done?
I can't drag anywhere! I cannot drag and drop to order pictures, cannot drag and drop from a collection to another collection... Nothing.
If I drag nothing happens. As if you don't click at all.
Are these regular collections, or smart collections?
Regular. I teach Lightroom I know I can't order pictures inside a smart collection...
In this closed thread you'll find other persons having the same problem. Can't drag and drop photos
For what I understand when someone report this bug on the web is often believed a beginner who ignores about the difference between dragging the picture or the frame.
But the bug exists!
Thank you for your patience!
I have the same problem. Mac OS X. I've been using Lightroom since version 4 but somewhere during 5 suddenly I couldn't drag anymore. One thread suggested deleting preferences (which is obviously bit of a pain) but afterwards I could drag and drop again. Yay! Then next time I started Lightroom dragging no longer worked.
I just forked out the upgrade price to get Lightroom 6. There's not many new features in it (that interest me) but I hoped it would solve this problem. No luck. So both 5 and 6 have this issue for me.
An answer in this thread said they solved it by reimporting from their LR4 collection. I've just upgraded to 6 and so imported from my old 5 collection. So that's not the answer for me.
Yes, I know to drag the thumbnail and not the frame. Even dragging photos within the same folder does not work. Even folders that Lightroom has just created during an import. I can drag a folder to another location (i.e. dragging the name under "Folders") but nothing to do with photos.
I posted 3 months ago having the same problems as everyone else. The problem started in LR5 (LR4 was OK) and the problem persisted once I upgraded to LR6. However, by chance I tried it again the other day in LR6 and it worked. Crazy. No idea why it's suddenly working again. OS X Yosemite still, I haven't upgraded LR or the OS. Very, very strange.