Krzysztof

But when there are selected theme “Twenty Eleven” and “Twenty Ten” it does not this problem.

In theme “twentytwelve” in the file “header.php” there is this
<title><?php wp_title( ‘|’, true, ‘right’ ); ?></title>

This there is wordpress multisite rogozno.wlkp.net.pl

yes and it works well

I updated anew 3.5.1

I had no updated network, but on updated still did not work.

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

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [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).*) $1 [L]
RewriteRule  ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

proper network activation Compatible up to: 3.4.2

In wordpress i do not have such file.
Path to file https://rogozno.wlkp.net.pl/files/2013/02/copy-rogoznowlkp2.jpg
He writes “picture can not be displayed because contains errors.