Leopard now hangs on shutdown and restart, but not if I unlog first

I've seen various people posting about this similar issue.
So basically my iBook was running fine with Tiger, and since I updated it to Leopard, it will hang when I want to restart or shut it down from the >Shutdown menu.
I tried many things, deinstalling stuff, and what have you. It seems however that running uninstaller programs or Maintenance which asks to restart to apply changes works.
So I tried first unlogging from the system, then from the login menu, hit the shutdown button, and it appears to work.
In the /var/log/system.log file there is nothing printed from the last entry just before I request the shutdown and when it powers back up.
Any idea how to definitely solve this problem? Sometimes I forget to manually log off, and holding down to hard stop the computer is something I used to laugh about when I used to be on windows...
Thanks for your advice.

Ok I see. Are the times displayed the american way, i.e: 12 hours per day? 24h per day? I can see some activity going on, but I can't tell if it was in the morning or in the afternoon :-P
I was about to come with some good news yesterday, as I thought to have found the problematic application, unfortunately after running OSX software update, Leopard got blocked once again upon shutdown. So I still can't tell whose fault it is.
Here is an excerpt of my log file, do I guess this happened just before I shutdown the computer as I closed Firefox and ran osx software update:
8/11/10 11 Aug 10:07:54 [0x0-0x1c01c].org.mozilla.firefox[474] Debugger() was called!
8/11/10 11 Aug 10:16:46 Software Update[582] arguments=(null)
Then here the computer got blocked and there is no more message printed in the log except for todays messages.
Well it's maybe firefox? I have a few extensions added to it, maybe it's not exiting cleanly? That's why my computer would get blocked only after a few hours of work, maybe firefox builds up at to a certain point where it's ready to lock the computer on shutdown?

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