I can not see thumbnails in my iMac just JPEG icons
I started using Dropbox and since then all my pictures and documents thumbnails change to JPEG icons.
I sent Dropbox to trash, but no change happened. I try almost everything to go back to my thumbnails whiteout success. I am a photographer and is very important to me that I can see thumbnails.
I run in my iMac an OS X El Capitan Version 10.11.6
Help me please
iMac 21.5″, OS X 10.11