Thanx for cpanel staff, but I've resolved problem myself.
Problem in Centos 5.9 quota package.
I've made this:
rpm -qa | grep quota
i've seen: quota-3.13-8.el5
then read this: /https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.9_Technical_Notes/quota.html
and this: /https://rhn.redhat.com/errata/RHSA-2013-0120.html
then:
cd /tmp
wget /ftp://mirror.switch.ch/pool/1/mirror/scientificlinux/58/x86_64/SL/quota-3.13-5.el5.x86_64.rpm
yum remove quota
rpm -ivh quota-3.13-5.el5.x86_64.rpm
/scripts/fixquotas
and quotas began to work.
also add quota* to excludes in yum.conf
now all's gooooood.
thanx