[syslog-ng]Access Control List on AIX system

I have been using syslog-ng 1.4.11 for several months. I found the "kill -HUP" command doesn't change an existing log file mode, which means not only the mode and ownership haven't been changed but also the Access Control List(acl) hasn't been changed. I just downloaded and run syslog-ng 1.5.7. I found a big change of this. When you do "kill -HUP", the log files' mode and ownership have been reset and the acl has been disabled. Mode and ownership are not a problem. But I really want to keep the old acl or allow me to reset it like the file mode and ownership. Kai