I create network on version 3.1.2 and it had worked well.
Аfter automatic upgrade to version 3.4.1 basic site has good functionality, but in the network site do not show images.
I can upload image in admin panel, can see it by ftp in directory:
But in web-browser I can't see the image.
If I do "Save image as.." on the broken image, I take good image on my disk.
WordPress work on the Ngnix web-server, and I don't have .htaccess file for edit.