Linux: lastb not working after I delete btmp

My /var/log/btmp file was too large so I deleted it.  I then created a new file with the same name and permissions:
touch /var/log/btmp
chown root:utmp /var/log/btmp
chmod 600 /var/log/btmp

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The problem is that now new items are NOT logged.

$ lastb
btmp begins Mon Nov 18 06:38:03 2013

I use CentOS.

I found this link, demonstrating that I am not the only one to experiance this problem:
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LuxanaConnect With a Mentor Commented:
try change permissions. They should be:

-rw-rw---- 1 root utmp


chmod 660 /var/log/btmp

at the moment only root has wr permissions to this file..
BTW: never delete your log files unless you have to. Best way to clean your log files is  simply to remove the content with:

# > /var/log/btmp

the above will simply remove content of the file while keeping file permissions intact.

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