I have a user who is suddenly unable to drag and drop documents into a shared document library. I recently updated the main page of the site, but the changes were purely cosmetic and I did not change any permissions or touch this library at all.
She has Full Control of the site and the library has no special restrictions, so I do not believe it is an issue with permissions. Note that she can still add documents to this library through the use of the New Document button.
I and another user I spoke to can still drag and drop to the library. I have tried in both Chrome and Internet Explorer and it works for me.
Is there something I may have missed that could be causing this issue? We are using Sharepoint 2013.