When I copy links to use, they no longer work. It comes up without the proper files.

I have the same problem... I've been sending Dropbox links for years and the links no longer work UNLESS I use the Share Feature from Dropbox.  I'd prefer to copy the link and send it via email like I always have. 

Here's the exact method I've been using for years (but no longer works):

Dropbox Web version:

1. I right click the folder I need a link for, then select "Copy Link" from the popup menu, and then I paste the link into an email.  The users can't open the file. 

2. Now that I'm aware of this ongoing issue, I can usually discern that the link won't work because the link text includes file names.  Links that work don't usually include folder / file names.  

Dropbox Desktop Folders/Files:

1. I quit copying links from my Dropbox Desktop folders as the links copied from there (using the same method as above) NEVER work as they always include folder / file names.