i have the same isue, and to me it's strange to see in the config file the full path of the real system, as the config file is executed by named inside the chroot environment, so there is no /var/named/chroot.... there, a simple modif in the named.conf to the pid file location solved the problem, meaning /var/run/named/named.pid (and he put it in the chroot env, not in the real system).
The problem is that ipconfig keeps modifing the named.conf file each time i update something (modif to the pid location), problem solved by modifying the data base and the named.conf.master file
my system is a clean centos4.4, named-chroot, postfix,proftpd
no install errors of ispconfig 2.2.10
hope that helps to make some more check on the install script to solve this problem, and i'll keep you posted if i find others