костыль

AllowOverride All
php_value default_charset utf8
php_admin_value mbstring.func_overload 2
php_value mbstring.internal_encoding utf8
php_admin_value realpath_cache_size "4096k" 

root@s1:/etc/apache2/vhosts/main# pwd
/etc/apache2/vhosts/main
root@s1:/etc/apache2/vhosts/main#

по сабжу ttp://dev.1c-bitrix.ru/support/forum/forum6/topic31617/