Safe sleep or hibernation won't work on my Macbook 13" Unibody (late 2008)

I have a 13" unibody Macbook which I bought in October 2008. The systems sleeps well once the lid is closed but if it runs out of battery it will not hibernate. I checked the output of pmset and everything is properly set for mode 3, which is the "safe sleep". I even tried setting it to hibernate only and it still goes to sleep.
I found several people with similar problems, but nobody seems to have solved the problem. I can't believe that such a simple thing as setting your system to hibernate can be so complicated to achieve with OS X.
My pmset output is below. The sleepfile is dated back to June 20 when I removed the file and it got automatically recreated during reboot, but no updates to the file since then. I don't have PGP installed (I did but I removed) and I have the system (including firmware) all updated to the latest versions.
mymac:~ user$ pmset -g
Active Profiles:
Battery Power -1
AC Power -1*
Currently in use:
sleep 0
sms 1
acwake 0
displaysleep 10
autorestart 0
hibernatefile /var/vm/sleepimage
hibernatemode 3
womp 0
halfdim 1
disksleep 10
lidwake 1
ttyskeepawake 1
mymac:~ user$ pmset -g cap
Capabilities for AC Power:
displaysleep
disksleep
sleep
womp
acwake
autorestart
lidwake
halfdim
sms
mymac:~ user$ ls -ls /var/vm/sleepimage
8388608 -rw------T 1 root wheel 4294967296 Jun 20 00:06 /var/vm/sleepimage
mymac:~ user$
Thanks,
Alberto.

I have found a solution to my Mac shutting down completely without using hibernation or safe sleep. It turns out about a year ago I ran SmartSleep. A piece of software to allow you to put the mac to sleep the old way. Turns out it corrupts the Powermanagment.plist file when uninstalled. It needs to be deleted to reset to system defaults. More info here:
http://markandkelley.com/mark/?p=75#comments
Whether this will stop my mac shutting down straight away anyway I have yet to find out, but at least the contents of the comp are saved first now.

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