postgresql log file not getting update

My postgresql-9.0-main.log file has suddenly stopped getting updated. I do
not know why it stopped all of a sudden. We made a slight modification
where changed in the postgresql.conf param:
From
log_connections = off
log_disconnections = off

To

log_connections = on
log_disconnections = on

I'm on a debian environment w/ version 9.0.7. It's a single instance w/ no
cluster on here. It was done w/a simple apt-get install back when, when it
was a fresh server (we'll call this db1)

I have an identical setup for another server (db4), and when I made the
change to the same paramers in conf, it's updating the
postgresql-9.0-main.log file. I reverted the connections and discon from
on back to off, and did a postgresql reload as well as pg_reload_conf().
For both servers. db4 the log file is getting updated db1 nothing. I
thought the file was locked or some perms may have changed and I deleted
the postgresql-9.0-main.log file. It didn't create a new log file until i
did a postgresql reload. It created the new file, but still nothing getting
written to it.

I know first thing people would say is to restart the instance, but
restarting is not an option for me in this case.

I've changed
ucommented out this param
#log_destination = 'stderr'

to be stderr, and even syslog and did a reload and nothing.

I know i should use log collector, but again, that also requires a restart
as well, unless a reload will work?

The way I reload is /etc/init.d/postgresql reload

The distro for Debian is squeeze. Again, it works on my other server, this
server it doesn't. Any one have any ideas, where I don't need to restart
the pg instance?
Thanks in advance.
-Anson