Multisite Thumbnail images

Good day,

I have a trouble with thumbnail images at my site. They are empty with next src
I use 4.1 Wordrpress version, and sub directory settings (…performa.by/en), but before site works about a year as single. Images saving to “…wp-content\uploads\sites”

in wp-config defined
('SUBDOMAIN_INSTALL', false );

in .htaccess I have:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

What should I do for correct work of multisite WP?