Now I have going true that list with no result. On some points even the homepage got 500 error but nothing helpt on the hole site.
Solution was at the bottom in .htaccess file: (I changed the # as it says)
# RewriteRule ^(.*)$ index.php?it=$1 [L,QSA]
# -----------------------------------------------------------------------------------------------
# 500 NOTE: If using VirtualDocumentRoot: comment out the one above and use this one instead.
# -----------------------------------------------------------------------------------------------
RewriteRule ^(.*)$ /index.php?it=$1 [L,QSA]