Images not displaying

Although the url to the images are correct, they simply will not display on the site nor in the Media Library. I’ve read a number of posts herein, but can’t find a solution. Any suggestions?

Notes:
a) Images display fine on main site
b) I’m using subdomain option with appropriate htaccess code
c) Images are located in wp-content/blogs.dir/5/files, and said path identified in Site Settings/Upload Path
d) Text/Theme design/color, etc. display properly, just no images are displayed

My htaccess and config file code…

.htaccess:

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

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

wp-config:

/* Multisite */
define( 'WP_ALLOW_MULTISITE', true );
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'domain.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);
$base = '/';